# Maxima and minima trig problem

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• November 23rd 2009, 09:28 PM
NDHS
Maxima and minima trig problem
I am having a problem trying to figure out the maxima and minima points of the function:
Quote:

$y=cosx(1+sinx), [0, 2\pi]$
I got to the derivative:
Quote:

$2sin^2x+sinx=-1$
But I don't know what to do from there. Any help would be appreciated.
• November 23rd 2009, 10:12 PM
qmech
It's a quadratic
Your final equation is a quadratic - use the quadratic equation to find the roots.

By the way, check your derivative. I seem to be getting a +1.