In this video I go over the following angle trigonometry identities:

cos(x)² = 1/2 (1 + cos2x)
sin(x)² = 1/2 (1 - cos2x)

These identities are important because they allow the ability to simplify some trigonometry functions and in my later videos, integrals of trig functions.

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Half-Angle Trigonometry Identities

Derives from my earlier video on the following double angle identity: