Posted by **lizzy** on Monday, October 8, 2012 at 6:10am.

Find derivative of:

g(theta) = cos^2(2theta-1)

- calculus help!!!! -
**Reiny**, Monday, October 8, 2012 at 8:50am
g ' (Ø) = 2cos(2Ø -1) (2)

= ...

- calculus help!!!! -
**Steve**, Monday, October 8, 2012 at 10:21am
hmmm. power rule, then chain rule twice

- calculus help!!!! -
**Reiny**, Monday, October 8, 2012 at 11:07am
yup, forgot about the exponent, Steve is right

g ' (x) = 2 cos(2Ø-1) (-sin(Ø-1)) ( 2)

= -4 sin(2Ø-1)cos(2Ø-1)

which they might have changed to

-2 sin(4Ø-2)

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