Evaluate $ lim_xrightarrow 0left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right) $ The 2019 Stack Overflow Developer Survey Results Are InCalculate: $lim_n rightarrowinftyleft(frac3^-nsin(3^(1-n))tan(3^1-2n) right)$computing $lim_x to 0 fracsin2x+arctan3x+3x^2lnleft(1+3x+sin^2xright)+xcdot e^x$Solve limit without use L'Hopital: $lim _xto 0left(fracsinleft(2xright)-2sinleft(xright)xcdot :arctg^2xright)$$lim_xto 1/2 left(fractan(pi x)2x-1+frac2pi(2x-1)^2right)$ using L' HopitalShow that $lim_n rightarrow inftyleft(n^2 - frac1sin^2(frac1n) right)=-frac13$Find $lim_xrightarrow fracpi4left(fracsin xcos xright)^left(fracsin 2xcos 2xright)$How can I calculate the following limit? $beginequation* lim_x rightarrow 0 fractan(x) - sin(x)x^3 endequation*,$No L' Hospital $ lim_x rightarrow 0 left (1+frac 1 arctan x right)^sin x$ and $ lim_x rightarrow 0 frac tan ^7 x ln (7x+1) $Calculating $lim_x rightarrow 0 fractan x - sin xx^3$.Evaluate: $lim_xto0left (frac4^tan(x)+ cos(x)2right)^cot(x)$

What is the most effective way of iterating a std::vector and why?

Why isn't the circumferential light around the M87 black hole's event horizon symmetric?

Is bread bad for ducks?

"as much details as you can remember"

What is the accessibility of a package's `Private` context variables?

FPGA - DIY Programming

Can a flute soloist sit?

Why can Shazam fly?

Is this app Icon Browser Safe/Legit?

Return to UK after being refused entry years previously

Why was M87 targetted for the Event Horizon Telescope instead of Sagittarius A*?

How technical should a Scrum Master be to effectively remove impediments?

Should I use my personal e-mail address, or my workplace one, when registering to external websites for work purposes?

How to type this arrow in math mode?

Falsification in Math vs Science

Why hard-Brexiteers don't insist on a hard border to prevent illegal immigration after Brexit?

Why didn't the Event Horizon Telescope team mention Sagittarius A*?

Is there any way to tell whether the shot is going to hit you or not?

How to save as into a customized destination on macOS?

Worn-tile Scrabble

Why do we hear so much about the Trump administration deciding to impose and then remove tariffs?

Shouldn't "much" here be used instead of "more"?

What is the meaning of Triage in Cybersec world?

How to deal with fear of taking dependencies



Evaluate $ lim_xrightarrow 0left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right) $



The 2019 Stack Overflow Developer Survey Results Are InCalculate: $lim_n rightarrowinftyleft(frac3^-nsin(3^(1-n))tan(3^1-2n) right)$computing $lim_x to 0 fracsin2x+arctan3x+3x^2lnleft(1+3x+sin^2xright)+xcdot e^x$Solve limit without use L'Hopital: $lim _xto 0left(fracsinleft(2xright)-2sinleft(xright)xcdot :arctg^2xright)$$lim_xto 1/2 left(fractan(pi x)2x-1+frac2pi(2x-1)^2right)$ using L' HopitalShow that $lim_n rightarrow inftyleft(n^2 - frac1sin^2(frac1n) right)=-frac13$Find $lim_xrightarrow fracpi4left(fracsin xcos xright)^left(fracsin 2xcos 2xright)$How can I calculate the following limit? $beginequation* lim_x rightarrow 0 fractan(x) - sin(x)x^3 endequation*,$No L' Hospital $ lim_x rightarrow 0 left (1+frac 1 arctan x right)^sin x$ and $ lim_x rightarrow 0 frac tan ^7 x ln (7x+1) $Calculating $lim_x rightarrow 0 fractan x - sin xx^3$.Evaluate: $lim_xto0left (frac4^tan(x)+ cos(x)2right)^cot(x)$










-1












$begingroup$


Calculate the limit
$$
lim_xrightarrow 0left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
$$

My try was to use the Taylor expansion of the denominator and numerator but it wasn't beauty approach.










share|cite|improve this question











$endgroup$
















    -1












    $begingroup$


    Calculate the limit
    $$
    lim_xrightarrow 0left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
    $$

    My try was to use the Taylor expansion of the denominator and numerator but it wasn't beauty approach.










    share|cite|improve this question











    $endgroup$














      -1












      -1








      -1


      0



      $begingroup$


      Calculate the limit
      $$
      lim_xrightarrow 0left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
      $$

      My try was to use the Taylor expansion of the denominator and numerator but it wasn't beauty approach.










      share|cite|improve this question











      $endgroup$




      Calculate the limit
      $$
      lim_xrightarrow 0left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
      $$

      My try was to use the Taylor expansion of the denominator and numerator but it wasn't beauty approach.







      real-analysis limits






      share|cite|improve this question















      share|cite|improve this question













      share|cite|improve this question




      share|cite|improve this question








      edited Mar 23 at 16:44









      Jneven

      953322




      953322










      asked Mar 23 at 16:01









      avan1235avan1235

      3598




      3598




















          2 Answers
          2






          active

          oldest

          votes


















          4












          $begingroup$

          Let $u=xsin x$



          $$lim_uto 0left(dfrac1utan u-dfrac1u^2right)=lim_uto 0dfracu-tan uu^2tan u$$



          Can you proceed?






          share|cite|improve this answer











          $endgroup$








          • 1




            $begingroup$
            I've corrected some errors, but the conversion back to $x$-space is unnecessary.
            $endgroup$
            – J.G.
            Mar 23 at 16:13










          • $begingroup$
            I'll remove that then @J.G.Thanks. Cheers :))
            $endgroup$
            – Paras Khosla
            Mar 23 at 16:13










          • $begingroup$
            Thanks, whats the official arguemnt to change $xsin(x)$ to $u$?
            $endgroup$
            – avan1235
            Mar 23 at 16:14






          • 2




            $begingroup$
            @avan1235 $lim_xto af(g(x))=lim_utolim_xto ag(x)f(u)$ provided $lim_xto ag(x)$ exists.
            $endgroup$
            – J.G.
            Mar 23 at 16:16






          • 1




            $begingroup$
            @avan1235: the rule of substitution in limits is as follows: if $lim_xto a f(x) =L$ and $lim_xto b g(x) =a$ and $g(x) neq a$ as $xto b$ then $$lim_xto b f(g(x)) =L=lim_xto a f(x) $$ Here $g(x)=xsin x, a=b=0$.
            $endgroup$
            – Paramanand Singh
            Mar 24 at 3:24


















          2












          $begingroup$

          The function you want to compute the limit of is even, so you can as well consider the limit for $xto0^+$.



          Consider the function $f(x)=xsin x$, defined and positive in a some interval $(0,delta)$, has limit $0$ for $xto0^+$ and $f'(x)=sin x+xcos x$. Thus we can assume $f'(x)>0$ over $(0,delta)$. Thus $f$ is continuous and invertible over $(0,delta)$ and therefore the substitution $u=xsin x$ is possible. Then
          $$
          lim_xto 0^+left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
          =lim_uto0^+fracu-tan uu^2tan u
          $$

          which is easy if you recall that
          $$
          tan u=u+frac13u^3+o(u^3)
          $$






          share|cite|improve this answer









          $endgroup$













            Your Answer





            StackExchange.ifUsing("editor", function ()
            return StackExchange.using("mathjaxEditing", function ()
            StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
            StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
            );
            );
            , "mathjax-editing");

            StackExchange.ready(function()
            var channelOptions =
            tags: "".split(" "),
            id: "69"
            ;
            initTagRenderer("".split(" "), "".split(" "), channelOptions);

            StackExchange.using("externalEditor", function()
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled)
            StackExchange.using("snippets", function()
            createEditor();
            );

            else
            createEditor();

            );

            function createEditor()
            StackExchange.prepareEditor(
            heartbeatType: 'answer',
            autoActivateHeartbeat: false,
            convertImagesToLinks: true,
            noModals: true,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: 10,
            bindNavPrevention: true,
            postfix: "",
            imageUploader:
            brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
            contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
            allowUrls: true
            ,
            noCode: true, onDemand: true,
            discardSelector: ".discard-answer"
            ,immediatelyShowMarkdownHelp:true
            );



            );













            draft saved

            draft discarded


















            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3159479%2fevaluate-lim-x-rightarrow-0-left-frac1x-sinx-tanx-sinx-frac1%23new-answer', 'question_page');

            );

            Post as a guest















            Required, but never shown

























            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            4












            $begingroup$

            Let $u=xsin x$



            $$lim_uto 0left(dfrac1utan u-dfrac1u^2right)=lim_uto 0dfracu-tan uu^2tan u$$



            Can you proceed?






            share|cite|improve this answer











            $endgroup$








            • 1




              $begingroup$
              I've corrected some errors, but the conversion back to $x$-space is unnecessary.
              $endgroup$
              – J.G.
              Mar 23 at 16:13










            • $begingroup$
              I'll remove that then @J.G.Thanks. Cheers :))
              $endgroup$
              – Paras Khosla
              Mar 23 at 16:13










            • $begingroup$
              Thanks, whats the official arguemnt to change $xsin(x)$ to $u$?
              $endgroup$
              – avan1235
              Mar 23 at 16:14






            • 2




              $begingroup$
              @avan1235 $lim_xto af(g(x))=lim_utolim_xto ag(x)f(u)$ provided $lim_xto ag(x)$ exists.
              $endgroup$
              – J.G.
              Mar 23 at 16:16






            • 1




              $begingroup$
              @avan1235: the rule of substitution in limits is as follows: if $lim_xto a f(x) =L$ and $lim_xto b g(x) =a$ and $g(x) neq a$ as $xto b$ then $$lim_xto b f(g(x)) =L=lim_xto a f(x) $$ Here $g(x)=xsin x, a=b=0$.
              $endgroup$
              – Paramanand Singh
              Mar 24 at 3:24















            4












            $begingroup$

            Let $u=xsin x$



            $$lim_uto 0left(dfrac1utan u-dfrac1u^2right)=lim_uto 0dfracu-tan uu^2tan u$$



            Can you proceed?






            share|cite|improve this answer











            $endgroup$








            • 1




              $begingroup$
              I've corrected some errors, but the conversion back to $x$-space is unnecessary.
              $endgroup$
              – J.G.
              Mar 23 at 16:13










            • $begingroup$
              I'll remove that then @J.G.Thanks. Cheers :))
              $endgroup$
              – Paras Khosla
              Mar 23 at 16:13










            • $begingroup$
              Thanks, whats the official arguemnt to change $xsin(x)$ to $u$?
              $endgroup$
              – avan1235
              Mar 23 at 16:14






            • 2




              $begingroup$
              @avan1235 $lim_xto af(g(x))=lim_utolim_xto ag(x)f(u)$ provided $lim_xto ag(x)$ exists.
              $endgroup$
              – J.G.
              Mar 23 at 16:16






            • 1




              $begingroup$
              @avan1235: the rule of substitution in limits is as follows: if $lim_xto a f(x) =L$ and $lim_xto b g(x) =a$ and $g(x) neq a$ as $xto b$ then $$lim_xto b f(g(x)) =L=lim_xto a f(x) $$ Here $g(x)=xsin x, a=b=0$.
              $endgroup$
              – Paramanand Singh
              Mar 24 at 3:24













            4












            4








            4





            $begingroup$

            Let $u=xsin x$



            $$lim_uto 0left(dfrac1utan u-dfrac1u^2right)=lim_uto 0dfracu-tan uu^2tan u$$



            Can you proceed?






            share|cite|improve this answer











            $endgroup$



            Let $u=xsin x$



            $$lim_uto 0left(dfrac1utan u-dfrac1u^2right)=lim_uto 0dfracu-tan uu^2tan u$$



            Can you proceed?







            share|cite|improve this answer














            share|cite|improve this answer



            share|cite|improve this answer








            edited Mar 23 at 16:14

























            answered Mar 23 at 16:08









            Paras KhoslaParas Khosla

            3,173626




            3,173626







            • 1




              $begingroup$
              I've corrected some errors, but the conversion back to $x$-space is unnecessary.
              $endgroup$
              – J.G.
              Mar 23 at 16:13










            • $begingroup$
              I'll remove that then @J.G.Thanks. Cheers :))
              $endgroup$
              – Paras Khosla
              Mar 23 at 16:13










            • $begingroup$
              Thanks, whats the official arguemnt to change $xsin(x)$ to $u$?
              $endgroup$
              – avan1235
              Mar 23 at 16:14






            • 2




              $begingroup$
              @avan1235 $lim_xto af(g(x))=lim_utolim_xto ag(x)f(u)$ provided $lim_xto ag(x)$ exists.
              $endgroup$
              – J.G.
              Mar 23 at 16:16






            • 1




              $begingroup$
              @avan1235: the rule of substitution in limits is as follows: if $lim_xto a f(x) =L$ and $lim_xto b g(x) =a$ and $g(x) neq a$ as $xto b$ then $$lim_xto b f(g(x)) =L=lim_xto a f(x) $$ Here $g(x)=xsin x, a=b=0$.
              $endgroup$
              – Paramanand Singh
              Mar 24 at 3:24












            • 1




              $begingroup$
              I've corrected some errors, but the conversion back to $x$-space is unnecessary.
              $endgroup$
              – J.G.
              Mar 23 at 16:13










            • $begingroup$
              I'll remove that then @J.G.Thanks. Cheers :))
              $endgroup$
              – Paras Khosla
              Mar 23 at 16:13










            • $begingroup$
              Thanks, whats the official arguemnt to change $xsin(x)$ to $u$?
              $endgroup$
              – avan1235
              Mar 23 at 16:14






            • 2




              $begingroup$
              @avan1235 $lim_xto af(g(x))=lim_utolim_xto ag(x)f(u)$ provided $lim_xto ag(x)$ exists.
              $endgroup$
              – J.G.
              Mar 23 at 16:16






            • 1




              $begingroup$
              @avan1235: the rule of substitution in limits is as follows: if $lim_xto a f(x) =L$ and $lim_xto b g(x) =a$ and $g(x) neq a$ as $xto b$ then $$lim_xto b f(g(x)) =L=lim_xto a f(x) $$ Here $g(x)=xsin x, a=b=0$.
              $endgroup$
              – Paramanand Singh
              Mar 24 at 3:24







            1




            1




            $begingroup$
            I've corrected some errors, but the conversion back to $x$-space is unnecessary.
            $endgroup$
            – J.G.
            Mar 23 at 16:13




            $begingroup$
            I've corrected some errors, but the conversion back to $x$-space is unnecessary.
            $endgroup$
            – J.G.
            Mar 23 at 16:13












            $begingroup$
            I'll remove that then @J.G.Thanks. Cheers :))
            $endgroup$
            – Paras Khosla
            Mar 23 at 16:13




            $begingroup$
            I'll remove that then @J.G.Thanks. Cheers :))
            $endgroup$
            – Paras Khosla
            Mar 23 at 16:13












            $begingroup$
            Thanks, whats the official arguemnt to change $xsin(x)$ to $u$?
            $endgroup$
            – avan1235
            Mar 23 at 16:14




            $begingroup$
            Thanks, whats the official arguemnt to change $xsin(x)$ to $u$?
            $endgroup$
            – avan1235
            Mar 23 at 16:14




            2




            2




            $begingroup$
            @avan1235 $lim_xto af(g(x))=lim_utolim_xto ag(x)f(u)$ provided $lim_xto ag(x)$ exists.
            $endgroup$
            – J.G.
            Mar 23 at 16:16




            $begingroup$
            @avan1235 $lim_xto af(g(x))=lim_utolim_xto ag(x)f(u)$ provided $lim_xto ag(x)$ exists.
            $endgroup$
            – J.G.
            Mar 23 at 16:16




            1




            1




            $begingroup$
            @avan1235: the rule of substitution in limits is as follows: if $lim_xto a f(x) =L$ and $lim_xto b g(x) =a$ and $g(x) neq a$ as $xto b$ then $$lim_xto b f(g(x)) =L=lim_xto a f(x) $$ Here $g(x)=xsin x, a=b=0$.
            $endgroup$
            – Paramanand Singh
            Mar 24 at 3:24




            $begingroup$
            @avan1235: the rule of substitution in limits is as follows: if $lim_xto a f(x) =L$ and $lim_xto b g(x) =a$ and $g(x) neq a$ as $xto b$ then $$lim_xto b f(g(x)) =L=lim_xto a f(x) $$ Here $g(x)=xsin x, a=b=0$.
            $endgroup$
            – Paramanand Singh
            Mar 24 at 3:24











            2












            $begingroup$

            The function you want to compute the limit of is even, so you can as well consider the limit for $xto0^+$.



            Consider the function $f(x)=xsin x$, defined and positive in a some interval $(0,delta)$, has limit $0$ for $xto0^+$ and $f'(x)=sin x+xcos x$. Thus we can assume $f'(x)>0$ over $(0,delta)$. Thus $f$ is continuous and invertible over $(0,delta)$ and therefore the substitution $u=xsin x$ is possible. Then
            $$
            lim_xto 0^+left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
            =lim_uto0^+fracu-tan uu^2tan u
            $$

            which is easy if you recall that
            $$
            tan u=u+frac13u^3+o(u^3)
            $$






            share|cite|improve this answer









            $endgroup$

















              2












              $begingroup$

              The function you want to compute the limit of is even, so you can as well consider the limit for $xto0^+$.



              Consider the function $f(x)=xsin x$, defined and positive in a some interval $(0,delta)$, has limit $0$ for $xto0^+$ and $f'(x)=sin x+xcos x$. Thus we can assume $f'(x)>0$ over $(0,delta)$. Thus $f$ is continuous and invertible over $(0,delta)$ and therefore the substitution $u=xsin x$ is possible. Then
              $$
              lim_xto 0^+left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
              =lim_uto0^+fracu-tan uu^2tan u
              $$

              which is easy if you recall that
              $$
              tan u=u+frac13u^3+o(u^3)
              $$






              share|cite|improve this answer









              $endgroup$















                2












                2








                2





                $begingroup$

                The function you want to compute the limit of is even, so you can as well consider the limit for $xto0^+$.



                Consider the function $f(x)=xsin x$, defined and positive in a some interval $(0,delta)$, has limit $0$ for $xto0^+$ and $f'(x)=sin x+xcos x$. Thus we can assume $f'(x)>0$ over $(0,delta)$. Thus $f$ is continuous and invertible over $(0,delta)$ and therefore the substitution $u=xsin x$ is possible. Then
                $$
                lim_xto 0^+left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
                =lim_uto0^+fracu-tan uu^2tan u
                $$

                which is easy if you recall that
                $$
                tan u=u+frac13u^3+o(u^3)
                $$






                share|cite|improve this answer









                $endgroup$



                The function you want to compute the limit of is even, so you can as well consider the limit for $xto0^+$.



                Consider the function $f(x)=xsin x$, defined and positive in a some interval $(0,delta)$, has limit $0$ for $xto0^+$ and $f'(x)=sin x+xcos x$. Thus we can assume $f'(x)>0$ over $(0,delta)$. Thus $f$ is continuous and invertible over $(0,delta)$ and therefore the substitution $u=xsin x$ is possible. Then
                $$
                lim_xto 0^+left( frac1xsin(x)tan(xsin(x))-frac1x^2sin^2(x) right)
                =lim_uto0^+fracu-tan uu^2tan u
                $$

                which is easy if you recall that
                $$
                tan u=u+frac13u^3+o(u^3)
                $$







                share|cite|improve this answer












                share|cite|improve this answer



                share|cite|improve this answer










                answered Mar 23 at 16:37









                egregegreg

                185k1486208




                185k1486208



























                    draft saved

                    draft discarded
















































                    Thanks for contributing an answer to Mathematics Stack Exchange!


                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid


                    • Asking for help, clarification, or responding to other answers.

                    • Making statements based on opinion; back them up with references or personal experience.

                    Use MathJax to format equations. MathJax reference.


                    To learn more, see our tips on writing great answers.




                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function ()
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fmath.stackexchange.com%2fquestions%2f3159479%2fevaluate-lim-x-rightarrow-0-left-frac1x-sinx-tanx-sinx-frac1%23new-answer', 'question_page');

                    );

                    Post as a guest















                    Required, but never shown





















































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown

































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown







                    Popular posts from this blog

                    Moe incest case Sentencing See also References Navigation menu"'Australian Josef Fritzl' fathered four children by daughter""Small town recoils in horror at 'Australian Fritzl' incest case""Victorian rape allegations echo Fritzl case - Just In (Australian Broadcasting Corporation)""Incest father jailed for 22 years""'Australian Fritzl' sentenced to 22 years in prison for abusing daughter for three decades""RSJ v The Queen"

                    Who is our nearest planetary neighbor, on average?Santa Claus flies to the South PoleSeven Spheres of Unequal Mass, a weighing problem with a twistDescribe a large integerFast Mental Calculation of $7.5^7$Math in Space (without the help of celebrities)Find the value of $bigstar$: Puzzle 8 - InequalityWho drinks beer while running anyway?A Crucial DeliveryRanking And AverageHow long will my money last at roulette?

                    Daza language Contents Vocabulary Phonology References External links Navigation menudaza1242Daza"Dazaga"eeee178086576