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DOUBLE-ANGLE, POWER-REDUCING, AND HALF-ANGLE …

Double-Angles Identities (Continued) • take the Pythagorean equation in this form, sin2 x = 1 – cos2 x and substitute into the First double-angle identity . cos 2x = cos2 x – sin2 x . cos 2x = cos2 x – (1 – cos2 x) cos 2x = cos. 2. x – 1 + cos. 2. x . cos 2x = 2cos. 2. x – 1 . Third double-angle identity for cosine. Summary of ...

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