Solve this following
Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \frac{d x}{\left(\sin ^{4} x+\cos ^{4} x\right)}=?$

A. $\frac{1}{\sqrt{2}} \tan ^{-1}\left(\frac{\tan ^{2} x-1}{\sqrt{2} \tan x}\right)+C$

B. $\frac{1}{\sqrt{2}} \tan ^{-1}\left(\frac{\tan ^{2} x-1}{\tan x}\right)+C$

C. $\frac{1}{\sqrt{2}} \tan ^{-1}\left(\frac{1}{\sqrt{2} \tan x}\right)+C$

D. None of these

Solution:

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