Mark against the correct answer in each of the following:
Question:

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

$\int \sec ^{3} x d x=?$

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

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

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

D. none of these

Solution:

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