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JEE Mains · Maths · STD 12 - 7.1 indefinite integral

माना \(\mathrm{I}(\mathrm{x})=\int \frac{\mathrm{x}^2\left(\mathrm{xsec}^2 \mathrm{x}+\tan \mathrm{x}\right)}{(\mathrm{x} \tan \mathrm{x}+1)^2} d x\) यदि \(\mathrm{I}(0)=0\) है, तब \(\mathrm{I}\left(\frac{\pi}{4}\right)\) का मान है

  1. A \(\log _{ e } \frac{( x +4)^2}{16}-\frac{\pi^2}{4(\pi+4)}\)
  2. B \(\log _{ e } \frac{(x+4)^2}{16}+\frac{\pi^2}{4(\pi+4)}\)
  3. C \(\log _e \frac{(x+4)^2}{32}-\frac{\pi^2}{4(\pi+4)}\)
  4. D \(\log _e \frac{(x+4)^2}{32}+\frac{\pi^2}{4(\pi+4)}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\log _e \frac{(x+4)^2}{32}-\frac{\pi^2}{4(\pi+4)}\)

Step-by-step Solution

Detailed explanation

\(I(x)=\int \frac{x^2\left(x \sec ^2 x+\tan x\right)}{(x \tan x+1)^2} d x\) Let \(x \tan x +1= t\) \(I=x^2\left(\frac{-1}{x \tan x+1}\right)+\int \frac{2 x}{x \tan x+1} d x\) \(I=x^2\left(\frac{-1}{x \tan x+1}\right)+2 \int \frac{x \cos x}{x \sin x+\cos x} d x\)…
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