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Calculus1 7 Online
OpenStudy (anonymous):

please help Write these products as sums: a. cos(2x)sin(5x) b. sin(3x)cos(2x) c. cos(7x)cos(2x)

Directrix (directrix):

The info at this link may be helpful. http://www.sosmath.com/trig/prodform/prodform.html

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