\(\int \frac{\cos x}{\sqrt{4-\sin^2 x}}dx\) equals

\(\sin^{-1}\left(x\right)+c\) \(\sin^{-1}\left(\frac{\sin x}{2}\right)+C\) \(\cos^{-1}\left(\frac{\sin x}{2}\right)+C\) \(\cos^{-1}\left(\frac{\cos x}{2}\right)+C\)

\(\sin^{-1}\left(\frac{\sin x}{2}\right)+C\)

Put \(\sin x=t\)