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AP EAMCET · Maths · Indefinite Integration

\[
\int\left(\sec ^4 x+\tan ^4 x\right) d x=
\]

  1. A \(\frac{2}{3} \tan ^3 x-\frac{2}{3} \tan x+x+c\)
  2. B \(\frac{1}{3} \sec ^2 x \tan x+\frac{5}{3} \tan x+\frac{\tan ^3 x}{3}+x+c\)
  3. C \(\frac{2}{3} \tan ^3 x+x+c\)
  4. D \(\frac{1}{3} \sec ^2 x \tan x-\frac{5}{3} \tan x+\frac{\tan ^3 x}{3}+x+c\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{2}{3} \tan ^3 x+x+c\)

Step-by-step Solution

Detailed explanation

\begin{aligned} & \text { } I=\int\left(\sec ^4 x+\tan ^4 x\right) d x \\ & =\int\left[\sec ^4 x+\left(\sec ^2 x-1\right)^2\right] d x \\ & =\int\left(2 \sec ^4 x-2 \sec ^2 x+1\right) d x \\ & =\int\left[2\left(1+\tan ^2 x\right) \sec ^2 x-2 \sec ^2 x+1\right] d x \\ &…