# Trigonometric Identities

by Cabal
Tags: identities, trigonometric
 P: 1 I can, for the mort part, understand how to derive and "proof" most of my Identity work, but some of the more complex (in my feeble opinion) problems give me quite a bit of trouble. Can anyone explain these? "Use the fundamental identities to simplify to sines and cosines: tan(^2)x - (csc(^2)x/cot(^2)x) " Someone told me the answer was (-1) and I had no idea how to get that. and "Confirm the Identity: (sinx)/(1-cosx) + (sinx)/(1+cosx) = 2cscx" Any explanations would be greatly appreciated! Thanks!
 Sci Advisor HW Helper P: 11,834 HINT:Use the definitions of "composite" functions (tan,cotan,sec,csc) and the fundamental identity $$\sin^{2}x+\cos^{2}x=1$$ Daniel.
 Emeritus Sci Advisor PF Gold P: 16,101 My usual advice is to convert everything into sines and cosines, and clear all denominators.

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