Posted by Jom on Sunday, May 13, 2012 at 10:40am.
Hmmmm. Wondering if you are taking calculus.
Calculus
y=sinxcosx
y'=0=cos^2x-sin^2x
cos^2x=sin^2x
tan^2 x=1
tanx= +-1
which occurs at increments of 45 degrees
x= +-PI/4, PI+-Pi/4
check that
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