Hey there. I've been doing turning points using quadratic equations and differentiation, but when it comes to using trigonomic deriviatives and the location of turning points I can't seem to find anything use In my text books.

If y = sin2x

If y = sin3x

"Using differentiation, what is the value of the gradient and what are the value of x for the first turning points?"

Obviously the deriviative is 2cos2x, 3cos3x, but locating the turning points from here is giving me a little trouble

. Any help is greatly appreciated as I think this may be on my exam.

(SORRY, i think this was posted in the wrong forum)