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August 1, 2015

Homework Help: trig

Posted by Evelina on Wednesday, November 30, 2011 at 8:09am.

I need to prove equality.
a) (sina + cosa)^2 -1 / ctga - sinacosa = 2tg^2a
b) (sin^2x/sinx-cosx) - (sinx+cosx/tg^2x+1) = sinx + cosx
c) sin^4a - sin^2a - cos^4a + cos^2a = cosπ/2
How to do these?

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