show what you have done, and especify the parts in which you need help.
You learn more by trying than by getting the right answer.
well i got the zeros in the first period to be zero and pi, but that was only through my calc. like i dont actually know how to write out that work. and for the first derivative i have 2cos2x-2xosx=0 and for second derivative i have -4sin2x+2sinx.