Integration of sin7x sin3x sin4x
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∫sin(7x)sin(3x) dx=∫21(cos(4x)−cos(10x)) dx=21∫cos(4x) dx−21∫cos(10x) dx=81∫cos(4x) d(4x)−201∫cos(10x) d(10x)=8sin(4x)−20sin(10x)=405sin(4x)−2sin(10x)
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