Example 19 - Prove cos 2x cos x/2 - cos 3x cos 9x/2 = sin 5x
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Ex 3.3, 19 - Prove sin x sin 3x / cos x cos 3x = tan 2x
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Ex 3.3, 20 - Prove sin x - sin 3x / sin2 x - cos2 x = 2 sin x
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