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May 30, 2015

Homework Help: verifying trigonometric identities

Posted by Anonymous on Monday, March 3, 2008 at 4:49pm.

How do I do these problems?
Verify the identity.
a= alpha, b=beta, t= theta

1. (1 + sin a) (1 - sin a)= cos^2a
2. cos^2b - sin^2b = 2cos^2b - 1
3. sin^2a - sin^4a = cos^2a - cos^4a
4. (csc^2 t / cot t) = csc t sec t
5. (cot^2 t / csc t) = csc t = sin t

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