Prove the identity. 1 - cos 50 cos 30 - sin 50 sin 30 = 2...
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Prove the identity. 1 - cos 50 cos 30 - sin 50 sin 30 = 2 sin 20 Prove the identity. 1 - cos 50 cos 30 - sin 50 sin 30 = 2 sin 20
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