1.

2 sin x cos x = ?cos 2xsin 2x\sin ^{2} xsin 2x\cos ^{2} xcos 2x

Answer»

ANSWER:

SIN(2X) = 2 sin(x) cos(x) cos(2x) = COS2(x) – sin2(x) = 1 – 2 sin2(x) = 2 cos2(x) – 1.



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