Posted by **Ana** on Wednesday, June 9, 2010 at 9:31pm.

in the one you helped me with, where did this come from: Where did this part come from?

- (sin^2Ø + cos^2Ø)

- Algebra 2 to Reiny -
**Reiny**, Wednesday, June 9, 2010 at 9:41pm
you should have come across the identity

sin^2Ø + cos^2Ø = 1 , called the Pythagorean

so I replaced 1 with that expression

- Algebra 2 to Reiny -
**Ana**, Wednesday, June 9, 2010 at 9:43pm
oh. I didn't think to connect it with that. Thank you for pointing it out to me.

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