# Thread: Maxima and minima trig problem

1. ## Maxima and minima trig problem

I am having a problem trying to figure out the maxima and minima points of the function:
$y=cosx(1+sinx), [0, 2\pi]$
I got to the derivative:
$2sin^2x+sinx=-1$
But I don't know what to do from there. Any help would be appreciated.