calculus help!!!!
posted by lizzy .
Find derivative of:
g(theta) = cos^2(2theta1)

g ' (Ø) = 2cos(2Ø 1) (2)
= ... 
hmmm. power rule, then chain rule twice

yup, forgot about the exponent, Steve is right
g ' (x) = 2 cos(2Ø1) (sin(Ø1)) ( 2)
= 4 sin(2Ø1)cos(2Ø1)
which they might have changed to
2 sin(4Ø2)