Find the derivative of the function and simplify your answer by using the trigonometric identities: y = cos x a) -200 & o a compa) b) 2 cos x - sin x = sin(2x) c) -2 cos x sin x = -sin(2x) d) 2 cos x - sin x = 2 sin x . e) 2 cos x sin x = 2 sin(2x)