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Prove that cot 4x (sin 5x + sin 3x) = cot x (sin 5x – sin 3x).
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Prove that cot 4x (sin 5x + sin 3x) = cot x (sin 5x – sin 3x).

User Jon Swanson
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Prove that cot 4x (sin 5x + sin 3x) = cot x (sin 5x – sin 3x).-example-1
User Jack Nutkins
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