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September 5, 2015

Homework Help: Math (trigonometry)

Posted by Lucy on Sunday, April 13, 2008 at 9:53pm.

Trigonometry identities are so hard...

I need some help proving these identities:
*Oh, and I'm only in grade 11, so the identities we use are quotient identity and Pythagorean identity.

sinx/(sinx + cosx) = tanx/(1 + tanx)

cos^2x - sin^2x = 2cos^2x - 1

Thanks!
Lucy

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