Evaluating $lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}$












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$$lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}$$
I think,it would be useful to start with simplifying the first term in the numerator as $(sqrt{x+x^3}-x)=x^{{3over2}}$ and leaving the denominator untouched.Then,i have to just work on the remaining term,but I can't figure out a way to not have $ln1=0$










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  • $begingroup$
    Note: $sqrt{x+x^3}-xneq x^{frac{3}{2}}$
    $endgroup$
    – coreyman317
    Jan 14 at 16:40












  • $begingroup$
    As $xto+infty$ $x$ is negligible with respect to $x^3$ and it becomes $sqrt {x^3}=x^{{3over2}}$ and then isn't $x$ negligible with respect to $x^{{3over2}}$?
    $endgroup$
    – Turan Nasibli
    Jan 14 at 16:44










  • $begingroup$
    While I'm sure you need the steps to get to the answer, it sometimes helps if one knows the answer which in this case is $-3/pi$.
    $endgroup$
    – JimB
    Jan 14 at 17:17










  • $begingroup$
    Just because they are asymptotically equivalent does not mean they are simply equal.
    $endgroup$
    – Simply Beautiful Art
    Jan 14 at 17:18










  • $begingroup$
    @JimB I know the answer as well,thanks anyway.
    $endgroup$
    – Turan Nasibli
    Jan 14 at 17:18
















0












$begingroup$


$$lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}$$
I think,it would be useful to start with simplifying the first term in the numerator as $(sqrt{x+x^3}-x)=x^{{3over2}}$ and leaving the denominator untouched.Then,i have to just work on the remaining term,but I can't figure out a way to not have $ln1=0$










share|cite|improve this question











$endgroup$












  • $begingroup$
    Note: $sqrt{x+x^3}-xneq x^{frac{3}{2}}$
    $endgroup$
    – coreyman317
    Jan 14 at 16:40












  • $begingroup$
    As $xto+infty$ $x$ is negligible with respect to $x^3$ and it becomes $sqrt {x^3}=x^{{3over2}}$ and then isn't $x$ negligible with respect to $x^{{3over2}}$?
    $endgroup$
    – Turan Nasibli
    Jan 14 at 16:44










  • $begingroup$
    While I'm sure you need the steps to get to the answer, it sometimes helps if one knows the answer which in this case is $-3/pi$.
    $endgroup$
    – JimB
    Jan 14 at 17:17










  • $begingroup$
    Just because they are asymptotically equivalent does not mean they are simply equal.
    $endgroup$
    – Simply Beautiful Art
    Jan 14 at 17:18










  • $begingroup$
    @JimB I know the answer as well,thanks anyway.
    $endgroup$
    – Turan Nasibli
    Jan 14 at 17:18














0












0








0





$begingroup$


$$lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}$$
I think,it would be useful to start with simplifying the first term in the numerator as $(sqrt{x+x^3}-x)=x^{{3over2}}$ and leaving the denominator untouched.Then,i have to just work on the remaining term,but I can't figure out a way to not have $ln1=0$










share|cite|improve this question











$endgroup$




$$lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}$$
I think,it would be useful to start with simplifying the first term in the numerator as $(sqrt{x+x^3}-x)=x^{{3over2}}$ and leaving the denominator untouched.Then,i have to just work on the remaining term,but I can't figure out a way to not have $ln1=0$







calculus limits radicals limits-without-lhopital






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edited Jan 14 at 18:56









Michael Rozenberg

109k1896200




109k1896200










asked Jan 14 at 16:36









Turan NasibliTuran Nasibli

846




846












  • $begingroup$
    Note: $sqrt{x+x^3}-xneq x^{frac{3}{2}}$
    $endgroup$
    – coreyman317
    Jan 14 at 16:40












  • $begingroup$
    As $xto+infty$ $x$ is negligible with respect to $x^3$ and it becomes $sqrt {x^3}=x^{{3over2}}$ and then isn't $x$ negligible with respect to $x^{{3over2}}$?
    $endgroup$
    – Turan Nasibli
    Jan 14 at 16:44










  • $begingroup$
    While I'm sure you need the steps to get to the answer, it sometimes helps if one knows the answer which in this case is $-3/pi$.
    $endgroup$
    – JimB
    Jan 14 at 17:17










  • $begingroup$
    Just because they are asymptotically equivalent does not mean they are simply equal.
    $endgroup$
    – Simply Beautiful Art
    Jan 14 at 17:18










  • $begingroup$
    @JimB I know the answer as well,thanks anyway.
    $endgroup$
    – Turan Nasibli
    Jan 14 at 17:18


















  • $begingroup$
    Note: $sqrt{x+x^3}-xneq x^{frac{3}{2}}$
    $endgroup$
    – coreyman317
    Jan 14 at 16:40












  • $begingroup$
    As $xto+infty$ $x$ is negligible with respect to $x^3$ and it becomes $sqrt {x^3}=x^{{3over2}}$ and then isn't $x$ negligible with respect to $x^{{3over2}}$?
    $endgroup$
    – Turan Nasibli
    Jan 14 at 16:44










  • $begingroup$
    While I'm sure you need the steps to get to the answer, it sometimes helps if one knows the answer which in this case is $-3/pi$.
    $endgroup$
    – JimB
    Jan 14 at 17:17










  • $begingroup$
    Just because they are asymptotically equivalent does not mean they are simply equal.
    $endgroup$
    – Simply Beautiful Art
    Jan 14 at 17:18










  • $begingroup$
    @JimB I know the answer as well,thanks anyway.
    $endgroup$
    – Turan Nasibli
    Jan 14 at 17:18
















$begingroup$
Note: $sqrt{x+x^3}-xneq x^{frac{3}{2}}$
$endgroup$
– coreyman317
Jan 14 at 16:40






$begingroup$
Note: $sqrt{x+x^3}-xneq x^{frac{3}{2}}$
$endgroup$
– coreyman317
Jan 14 at 16:40














$begingroup$
As $xto+infty$ $x$ is negligible with respect to $x^3$ and it becomes $sqrt {x^3}=x^{{3over2}}$ and then isn't $x$ negligible with respect to $x^{{3over2}}$?
$endgroup$
– Turan Nasibli
Jan 14 at 16:44




$begingroup$
As $xto+infty$ $x$ is negligible with respect to $x^3$ and it becomes $sqrt {x^3}=x^{{3over2}}$ and then isn't $x$ negligible with respect to $x^{{3over2}}$?
$endgroup$
– Turan Nasibli
Jan 14 at 16:44












$begingroup$
While I'm sure you need the steps to get to the answer, it sometimes helps if one knows the answer which in this case is $-3/pi$.
$endgroup$
– JimB
Jan 14 at 17:17




$begingroup$
While I'm sure you need the steps to get to the answer, it sometimes helps if one knows the answer which in this case is $-3/pi$.
$endgroup$
– JimB
Jan 14 at 17:17












$begingroup$
Just because they are asymptotically equivalent does not mean they are simply equal.
$endgroup$
– Simply Beautiful Art
Jan 14 at 17:18




$begingroup$
Just because they are asymptotically equivalent does not mean they are simply equal.
$endgroup$
– Simply Beautiful Art
Jan 14 at 17:18












$begingroup$
@JimB I know the answer as well,thanks anyway.
$endgroup$
– Turan Nasibli
Jan 14 at 17:18




$begingroup$
@JimB I know the answer as well,thanks anyway.
$endgroup$
– Turan Nasibli
Jan 14 at 17:18










2 Answers
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$begingroup$

$$lim_{xto+infty}frac{(sqrt{x+x^3}-x)lnfrac{sqrt{4x+1}}{2sqrt x +3}}{xarctan x}=lim_{xto+infty}frac{x^3lnleft(frac{sqrt{4x+1}}{2sqrt x +3}-1+1right)}{(sqrt{x+x^3}-x)xarctan x}=$$
$$=lim_{xto+infty}frac{x^2left(frac{sqrt{4x+1}}{2sqrt x +3}-1right)}{(sqrt{x+x^3}-x)arctan x}=lim_{xto+infty}frac{x^2(4x+1-4x-12sqrt{x}-9)}{(2sqrt x +3)(sqrt{4x+1}+2sqrt x +3)(sqrt{x+x^3}-x)arctan x}=$$
$$=lim_{xto+infty}frac{-12-frac{8}{sqrt{x}}}{left(2 +frac{3}{sqrt{x}}right)left(sqrt{4+frac{1}{x}}+2 +frac{3}{sqrt{x}}right)left(sqrt{frac{1}{x^2}+1}-frac{1}{sqrt{x}}right)arctan x}=$$
$$=frac{-12}{2cdot4cdot1cdotfrac{pi}{2}}=-frac{3}{pi}.$$






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    0












    $begingroup$

    $$I=lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}=dfrac2pilim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}x$$



    Set $x=1/h^2,hto0^+$



    $$sqrt{x+x^3}-x=sqrt{dfrac1{h^2}+dfrac1{h^6}}-dfrac{1}{h^2}=dfrac{sqrt{1+h^4}-h}{h^3}text{ and }dfrac{sqrt{4x+1}}{2sqrt{x}+3}= dfrac{sqrt{4+h^2}}{2+3h} $$



    $$dfrac{pi I}2=lim_{hto0^+}dfrac{h^2(sqrt{1+h^4}-h)}{h^3}lnleft(dfrac{sqrt{4+h^2}}{2+3h}right)$$



    $2lnleft(dfrac{sqrt{4+h^2}}{2+3 h}right)=lndfrac{4+h^2}{(2+3h)^2}=lnleft(1-dfrac{12h}{(2+3h)^2}right)$



    $$pi I=-lim_{hto0^+}(sqrt{1+h^4}-h)cdotlim_{hto0^+}left(lim_{hto0^+}dfrac{lnleft(1-dfrac{12h}{(2+3h)^2}right)}{-dfrac{12h}{(2+3h)^2}}right)cdotlim_{hto0^+}dfrac{dfrac{12h}{(2+3h)^2}}h=-1cdot1cdotdfrac{12}4$$






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      2 Answers
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      2 Answers
      2






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      active

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      active

      oldest

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      2












      $begingroup$

      $$lim_{xto+infty}frac{(sqrt{x+x^3}-x)lnfrac{sqrt{4x+1}}{2sqrt x +3}}{xarctan x}=lim_{xto+infty}frac{x^3lnleft(frac{sqrt{4x+1}}{2sqrt x +3}-1+1right)}{(sqrt{x+x^3}-x)xarctan x}=$$
      $$=lim_{xto+infty}frac{x^2left(frac{sqrt{4x+1}}{2sqrt x +3}-1right)}{(sqrt{x+x^3}-x)arctan x}=lim_{xto+infty}frac{x^2(4x+1-4x-12sqrt{x}-9)}{(2sqrt x +3)(sqrt{4x+1}+2sqrt x +3)(sqrt{x+x^3}-x)arctan x}=$$
      $$=lim_{xto+infty}frac{-12-frac{8}{sqrt{x}}}{left(2 +frac{3}{sqrt{x}}right)left(sqrt{4+frac{1}{x}}+2 +frac{3}{sqrt{x}}right)left(sqrt{frac{1}{x^2}+1}-frac{1}{sqrt{x}}right)arctan x}=$$
      $$=frac{-12}{2cdot4cdot1cdotfrac{pi}{2}}=-frac{3}{pi}.$$






      share|cite|improve this answer









      $endgroup$


















        2












        $begingroup$

        $$lim_{xto+infty}frac{(sqrt{x+x^3}-x)lnfrac{sqrt{4x+1}}{2sqrt x +3}}{xarctan x}=lim_{xto+infty}frac{x^3lnleft(frac{sqrt{4x+1}}{2sqrt x +3}-1+1right)}{(sqrt{x+x^3}-x)xarctan x}=$$
        $$=lim_{xto+infty}frac{x^2left(frac{sqrt{4x+1}}{2sqrt x +3}-1right)}{(sqrt{x+x^3}-x)arctan x}=lim_{xto+infty}frac{x^2(4x+1-4x-12sqrt{x}-9)}{(2sqrt x +3)(sqrt{4x+1}+2sqrt x +3)(sqrt{x+x^3}-x)arctan x}=$$
        $$=lim_{xto+infty}frac{-12-frac{8}{sqrt{x}}}{left(2 +frac{3}{sqrt{x}}right)left(sqrt{4+frac{1}{x}}+2 +frac{3}{sqrt{x}}right)left(sqrt{frac{1}{x^2}+1}-frac{1}{sqrt{x}}right)arctan x}=$$
        $$=frac{-12}{2cdot4cdot1cdotfrac{pi}{2}}=-frac{3}{pi}.$$






        share|cite|improve this answer









        $endgroup$
















          2












          2








          2





          $begingroup$

          $$lim_{xto+infty}frac{(sqrt{x+x^3}-x)lnfrac{sqrt{4x+1}}{2sqrt x +3}}{xarctan x}=lim_{xto+infty}frac{x^3lnleft(frac{sqrt{4x+1}}{2sqrt x +3}-1+1right)}{(sqrt{x+x^3}-x)xarctan x}=$$
          $$=lim_{xto+infty}frac{x^2left(frac{sqrt{4x+1}}{2sqrt x +3}-1right)}{(sqrt{x+x^3}-x)arctan x}=lim_{xto+infty}frac{x^2(4x+1-4x-12sqrt{x}-9)}{(2sqrt x +3)(sqrt{4x+1}+2sqrt x +3)(sqrt{x+x^3}-x)arctan x}=$$
          $$=lim_{xto+infty}frac{-12-frac{8}{sqrt{x}}}{left(2 +frac{3}{sqrt{x}}right)left(sqrt{4+frac{1}{x}}+2 +frac{3}{sqrt{x}}right)left(sqrt{frac{1}{x^2}+1}-frac{1}{sqrt{x}}right)arctan x}=$$
          $$=frac{-12}{2cdot4cdot1cdotfrac{pi}{2}}=-frac{3}{pi}.$$






          share|cite|improve this answer









          $endgroup$



          $$lim_{xto+infty}frac{(sqrt{x+x^3}-x)lnfrac{sqrt{4x+1}}{2sqrt x +3}}{xarctan x}=lim_{xto+infty}frac{x^3lnleft(frac{sqrt{4x+1}}{2sqrt x +3}-1+1right)}{(sqrt{x+x^3}-x)xarctan x}=$$
          $$=lim_{xto+infty}frac{x^2left(frac{sqrt{4x+1}}{2sqrt x +3}-1right)}{(sqrt{x+x^3}-x)arctan x}=lim_{xto+infty}frac{x^2(4x+1-4x-12sqrt{x}-9)}{(2sqrt x +3)(sqrt{4x+1}+2sqrt x +3)(sqrt{x+x^3}-x)arctan x}=$$
          $$=lim_{xto+infty}frac{-12-frac{8}{sqrt{x}}}{left(2 +frac{3}{sqrt{x}}right)left(sqrt{4+frac{1}{x}}+2 +frac{3}{sqrt{x}}right)left(sqrt{frac{1}{x^2}+1}-frac{1}{sqrt{x}}right)arctan x}=$$
          $$=frac{-12}{2cdot4cdot1cdotfrac{pi}{2}}=-frac{3}{pi}.$$







          share|cite|improve this answer












          share|cite|improve this answer



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          answered Jan 14 at 18:54









          Michael RozenbergMichael Rozenberg

          109k1896200




          109k1896200























              0












              $begingroup$

              $$I=lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}=dfrac2pilim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}x$$



              Set $x=1/h^2,hto0^+$



              $$sqrt{x+x^3}-x=sqrt{dfrac1{h^2}+dfrac1{h^6}}-dfrac{1}{h^2}=dfrac{sqrt{1+h^4}-h}{h^3}text{ and }dfrac{sqrt{4x+1}}{2sqrt{x}+3}= dfrac{sqrt{4+h^2}}{2+3h} $$



              $$dfrac{pi I}2=lim_{hto0^+}dfrac{h^2(sqrt{1+h^4}-h)}{h^3}lnleft(dfrac{sqrt{4+h^2}}{2+3h}right)$$



              $2lnleft(dfrac{sqrt{4+h^2}}{2+3 h}right)=lndfrac{4+h^2}{(2+3h)^2}=lnleft(1-dfrac{12h}{(2+3h)^2}right)$



              $$pi I=-lim_{hto0^+}(sqrt{1+h^4}-h)cdotlim_{hto0^+}left(lim_{hto0^+}dfrac{lnleft(1-dfrac{12h}{(2+3h)^2}right)}{-dfrac{12h}{(2+3h)^2}}right)cdotlim_{hto0^+}dfrac{dfrac{12h}{(2+3h)^2}}h=-1cdot1cdotdfrac{12}4$$






              share|cite|improve this answer









              $endgroup$


















                0












                $begingroup$

                $$I=lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}=dfrac2pilim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}x$$



                Set $x=1/h^2,hto0^+$



                $$sqrt{x+x^3}-x=sqrt{dfrac1{h^2}+dfrac1{h^6}}-dfrac{1}{h^2}=dfrac{sqrt{1+h^4}-h}{h^3}text{ and }dfrac{sqrt{4x+1}}{2sqrt{x}+3}= dfrac{sqrt{4+h^2}}{2+3h} $$



                $$dfrac{pi I}2=lim_{hto0^+}dfrac{h^2(sqrt{1+h^4}-h)}{h^3}lnleft(dfrac{sqrt{4+h^2}}{2+3h}right)$$



                $2lnleft(dfrac{sqrt{4+h^2}}{2+3 h}right)=lndfrac{4+h^2}{(2+3h)^2}=lnleft(1-dfrac{12h}{(2+3h)^2}right)$



                $$pi I=-lim_{hto0^+}(sqrt{1+h^4}-h)cdotlim_{hto0^+}left(lim_{hto0^+}dfrac{lnleft(1-dfrac{12h}{(2+3h)^2}right)}{-dfrac{12h}{(2+3h)^2}}right)cdotlim_{hto0^+}dfrac{dfrac{12h}{(2+3h)^2}}h=-1cdot1cdotdfrac{12}4$$






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                $endgroup$
















                  0












                  0








                  0





                  $begingroup$

                  $$I=lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}=dfrac2pilim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}x$$



                  Set $x=1/h^2,hto0^+$



                  $$sqrt{x+x^3}-x=sqrt{dfrac1{h^2}+dfrac1{h^6}}-dfrac{1}{h^2}=dfrac{sqrt{1+h^4}-h}{h^3}text{ and }dfrac{sqrt{4x+1}}{2sqrt{x}+3}= dfrac{sqrt{4+h^2}}{2+3h} $$



                  $$dfrac{pi I}2=lim_{hto0^+}dfrac{h^2(sqrt{1+h^4}-h)}{h^3}lnleft(dfrac{sqrt{4+h^2}}{2+3h}right)$$



                  $2lnleft(dfrac{sqrt{4+h^2}}{2+3 h}right)=lndfrac{4+h^2}{(2+3h)^2}=lnleft(1-dfrac{12h}{(2+3h)^2}right)$



                  $$pi I=-lim_{hto0^+}(sqrt{1+h^4}-h)cdotlim_{hto0^+}left(lim_{hto0^+}dfrac{lnleft(1-dfrac{12h}{(2+3h)^2}right)}{-dfrac{12h}{(2+3h)^2}}right)cdotlim_{hto0^+}dfrac{dfrac{12h}{(2+3h)^2}}h=-1cdot1cdotdfrac{12}4$$






                  share|cite|improve this answer









                  $endgroup$



                  $$I=lim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}{xarctan x}=dfrac2pilim_{xto+infty}frac{(sqrt{x+x^3}-x)ln(frac{sqrt{4x+1}}{2sqrt x +3})}x$$



                  Set $x=1/h^2,hto0^+$



                  $$sqrt{x+x^3}-x=sqrt{dfrac1{h^2}+dfrac1{h^6}}-dfrac{1}{h^2}=dfrac{sqrt{1+h^4}-h}{h^3}text{ and }dfrac{sqrt{4x+1}}{2sqrt{x}+3}= dfrac{sqrt{4+h^2}}{2+3h} $$



                  $$dfrac{pi I}2=lim_{hto0^+}dfrac{h^2(sqrt{1+h^4}-h)}{h^3}lnleft(dfrac{sqrt{4+h^2}}{2+3h}right)$$



                  $2lnleft(dfrac{sqrt{4+h^2}}{2+3 h}right)=lndfrac{4+h^2}{(2+3h)^2}=lnleft(1-dfrac{12h}{(2+3h)^2}right)$



                  $$pi I=-lim_{hto0^+}(sqrt{1+h^4}-h)cdotlim_{hto0^+}left(lim_{hto0^+}dfrac{lnleft(1-dfrac{12h}{(2+3h)^2}right)}{-dfrac{12h}{(2+3h)^2}}right)cdotlim_{hto0^+}dfrac{dfrac{12h}{(2+3h)^2}}h=-1cdot1cdotdfrac{12}4$$







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                  answered Jan 17 at 14:52









                  lab bhattacharjeelab bhattacharjee

                  227k15158278




                  227k15158278






























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