\(\int\frac{cosx}{\sqrt{sin^2x-2sin\,x-3}}dx\) = ?
∫cos x/√sin2x - 2sin x - 3}dx
A. log| sin x + \(\sqrt{sin^2x-2sin\,x-3}\)| + c
B. log| (sin x - 1) + \(\sqrt{sin^2x-2sin\,x-3}\)| + c
C. log| (sin x - 1) - \(\sqrt{sin^2x-2sin\,x-3}\)| + c
D. none of these