Trigonometry Identities: cos(x +/- y) = cos(x)cos(y) -/+ sin(x)sin(y)

over 1 year ago (Edited)

In this video I derive addition and subtraction identities, cos(x+y) and cos(x-y), using the Law of Cosines and the Pythagorean Theorem. This identity is very useful in all of mathematics and is used in the derivations of many trigonometric derivatives and integrals.

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