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Express sin4xcos3x as a sum or differences of sines and cosines
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use your product-to-sum formulas:
sinAcosB = 1/2 (sin(A+B) + sin(A-B))
sin4x cos3x = 1/2 (sin7x + sin(x))
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express the given product as a sum or difference containing only sines or cosines. sin(6x)cos(4x)
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