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Verify the identiny of 1. sin 3 theta sin theta = 1/2(cos 2 theta - cos 4 theta) 2. sin 3x cos2x=1/2(sin 5x + sin x)?

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  • Verify the identiny of 1. sin 3 theta sin theta = 1/2(cos 2 theta - cos 4 theta) 2. sin 3x cos2x=1/2(sin 5x + sin x)?


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