Trigonometric identities
April 20th, 2008
More important identities
You don’t have to know all the identities off the top of your head. But these you should.
- Defining relations for tangent, cotangent, secant, and cosecant in terms of sine and cosine.
-
tan t = sin t
cos tcot t = 1
tan t= cos t
sin tsec t = 1
cos tcsc t = 1
sin t - The Pythagorean formula for sines and cosines.
- sin2 t + cos2 t = 1
ainaa on 
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