Saturday, February 2, 2008

 

The Sum and Difference Identities For Sine and Cosine:

cos(alpha +/- beta) == cos(alpha)cos(beta) -/+ sin(alpha)sin(beta)

sin(alpha +/- beta) == sin(alpha)cos(beta) +/- cos(alpha)sin(beta)

Trig - Identities - Deriving the Sum and Difference Identities - Part 1

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