Thread: more derivatives...help!

(x) = sin^2(x) - cos(x) on the interval 0 x .

ok so can you point me in the right direction for this one, and also how to find the local and global maximums...thanks...

Point you only to the right direction?

Get the f'(x), or the 1st derivative of f(x).
Set it to zero to get the critical points. There shpould be 3 of them in that interval.
The highest f(x) among the 3 is the global maximum. It is at x = 2pi/3.