differentiate sin 5x cos3x
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sin5x d/dx(cos3x)+cos3x d/dx(sin5x)
=sin5x(-3sin3x)+cos3x(5cos5x)
=-3sin5xsin3x+5cos3xcos5x
=sin5x(-3sin3x)+cos3x(5cos5x)
=-3sin5xsin3x+5cos3xcos5x
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