Remember that when is a constant, Other than that, you are on the right track.
Determine the extreme values of the following function in the given interval.
f(x)=2sin4x+3 , XE [0, pi]
This is my work:
f'(x)=2cos4x (4)
f'(x)=8cos4x
Now I am trying to find the critical numbers, but I'm not sure how to solve for x.
f'(x)=0
cos4x=0
x=22.5
Is this right?