_prove-that-n-9234-cos-9234-4x-9234-cos-9234-3x-9234-cos-9234-2x-9234-sin-9234-4x-9234-sin-9234-3x-9234-sin-9.jpg "Prove thatn`( \\" cos\\" 4x + \\" cos\\" 3x+ \\" cos\\" 2x) (\\" sin \\" 4x + \\" sin \\" 3x + \\" sin \\" 2x) = from sin2x sin4x cos2x cos4x Video Screenshot Preview 1")
Gallery_prove-that-n-9234-cos-9234-4x-9234-cos-9234-3x-9234-cos-9234-2x-9234-sin-9234-4x-9234-sin-9234-3x-9234-sin-9.jpg "Prove thatn`( \\" cos\\" 4x + \\" cos\\" 3x+ \\" cos\\" 2x) (\\" sin \\" 4x + \\" sin \\" 3x + \\" sin \\" 2x) = from sin2x sin4x cos2x cos4x Video Screenshot Preview 3")
Gallery_prove-that-n-9234-cos-9234-4x-9234-cos-9234-3x-9234-cos-9234-2x-9234-sin-9234-4x-9234-sin-9234-3x-9234-sin-9.jpg "Prove thatn`( \\" cos\\" 4x + \\" cos\\" 3x+ \\" cos\\" 2x) (\\" sin \\" 4x + \\" sin \\" 3x + \\" sin \\" 2x) = from sin2x sin4x cos2x cos4x Video Screenshot Preview hqdefault")
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