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2) sin2x = s(nax = (sinazèosxqo - cosKslXqo -a — Cosx- X Sin sin2x = 2sinxcosx cos2x = cos2x — sin 2COS2X J— 1 = 1 — 2sin2x Verifving Identities Double Angle Formulas EXAMPLES: 1) cos4x — sin4x = cos2x x 2 tanx tan2x 1—tan2x - cosat)l Cosax—cosax sin2x = 2sinxcosx -24 . 2) If cos x: Quadrant Ill, 25 a) sin 2x= a sinteos)C 331.0 ... ................
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