Question

help me please
given sin 2x =2 sin x cos x , shows that (sin 2x)' = 2 cos 2x

Answer 1

see derivative of sinx = cos x okay..??

if angle is replaced by x=2x then 1st you hhave to take derivative of sin 2x= cos2x then take derivative of angle i.e. derivative of 2x=2

so (sin2x)'=2 cos2x