Solve this following
Question:

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

$\int \sec ^{4} x \tan x d x=?$

A. $\frac{1}{2} \sec ^{2} x+\frac{1}{4} \sec ^{4} x+C$

B. $\frac{1}{2} \tan ^{2} \mathrm{x}+\frac{1}{4} \tan ^{4} \mathrm{x}+\mathrm{C}$

C. $\frac{1}{2} \sec x+\log |\sec x+\tan x|+C$

D. none of these

Solution:

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