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Home  >>  JEEMAIN and AIPMT  >>  Mathematics  >>  Class12  >>  Integral Calculus
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Integrate : $\int \large\frac{\tan^2 (\sqrt x)}{\sqrt x}$$.dx$

\[\begin {array} {1 1} (a)\;2(\sqrt x +\tan^{-1} \sqrt x)+c \\ (b)\;2(\sqrt x -\tan^{-1} \sqrt x)+c \\ (c)\;2(-\sqrt {x}+\tan ^{-1}(\sqrt x)]+c \\ (d)\;None \end {array}\]

Can you answer this question?
 
 

1 Answer

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$\sqrt x =t => \large\frac{-1}{2}$$(x)^{-1/2}.dx=dt$
$\qquad= -2 dt$
$\qquad= (-2) \int \tan ^2 (t) .dt$
$\qquad= (-2) \int (\sec^2 t-1).dt$
=> $ -2. \tan t +2t +c$
=> $ -2 \tan \sqrt x+ 2 \sqrt x +c$
=> $2 (\sqrt x - \tan x )+c$
Hence b is the correct answer.
answered Dec 19, 2013 by meena.p
 

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