Calculus grade 12
posted by Julie .
a) determine the derivative of y = sin2x
b) determine the derivative of y = 2SinxCosx
c) shoe that derivatives in parts a) and b) are equal
d) explain why derivatives in parts a) and be should be equal.

a) 2cos2x
b) 2cosx*cosx  2sinx*sinx = 2cos2x
c) double angle identity