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January 30, 2015

January 30, 2015

Posted by **Jom** on Sunday, May 13, 2012 at 10:40am.

- trig -
**bobpursley**, Sunday, May 13, 2012 at 12:46pmHmmmm. 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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