Question

derivative of these:
F(x)=-1/4 cos2x
G(x)=-1/2 cos^2 x

Answer 1

actually, the chain rule will works

Answer 2

for F(x)=-1/4 cos2x
the derivative oc 2x = 2
the derivative of cos(...) = -sin(...)

so, f ' (x) = -1/4 (2-sin(2x)) = - 1/2 + (1/4) sin(2x)

Answer 3

* of

Answer 4

right ............... im trying it now

Answer 5

the chain rule made me see the idea clearly ... thanks