1.

How do find the derivative of y = cos2 x ?

Answer»

First of all y = cos2x = (cos x)2

Hence

y' = 2 cos x⋅(cos x)'

= 2 cos x⋅(−sin x)

= −2 cos x⋅ sin x

= −sin 2x



Discussion

No Comment Found

Related InterviewSolutions