Question

Differenciate it
answer is
cos4x + cos2x
no spams please​

Answer 1

Answer:

-2(2sin4x+sin2x)

Step-by-step explanation:

let Y = cos 2x + cos 4x

differentiate with respect to x

dy/dx=dcos4x/dx +dcos2x/dx

=-4sin4x-2sin2x

=-2(2sin4x + sin2x)