Turunan pertama fungsi y=(sin x/cos x)+(cos x/sin x)

Turunan pertama fungsi y=(sin x/cos x)+(cos x/sin x) adalah... (A) (1/cos^2 x)-(1/sin^2 x) (B) -(1/cos^2 x)+(1/sin^2 x). (C) 1/(cos^2 sin^2 x) (D) 1/(cos^2 sin^2 x) (E) cos^2 sin^2 x