Question:
Mark $(\sqrt{ })$ against the correct answer in each of the following:
$\int \frac{\cos x}{\sqrt{4-\sin ^{2} x}}=?$
A. $\sin ^{-1} \frac{x}{2}+C$
B. $\sin ^{-1}\left(\frac{1}{2} \cos x\right)+C$
C. $\sin ^{-1}(2 \sin x)+C$
D. $\sin ^{-1}\left(\frac{1}{2} \sin x\right)+C$
Solution:
