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You to find when f'=0

Oh, alright, seems simple enough, thanks!

Did you ever find f'?

It would be
\[\LARGE f'(x)=2cosx+2sinxcosx\]
right?

right now set that =0 and solve for x

\[2\cos(x)(1+\sin(x))=0\]

Solve both equations:
cos(x)=0
1+sin(x)=0

And that'll give me x, to plug in and find y right?

Alright, thanks again myininaya :)