Question:
Mark $(\sqrt{ })$ against the correct answer in each of the following:
$\int \frac{\sec ^{2} x}{\sqrt{\tan ^{2} x-4}} d x=?$
A. $\log \left|\tan x-\sqrt{\tan ^{2} x-4}\right|+C$
B. $\log \left|\tan x+\sqrt{\tan ^{2} x-4}\right|+C$
C. $\frac{1}{2} \log \left|\tan x+\sqrt{\tan ^{2} x-4}\right|+C$
D. none of these
Solution:
