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7 March, 09:59

Write the product cos (2x) sin (5x) as a sum

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  1. 7 March, 13:56
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    The product to sum identity formula states

    cos (a) sin (b) = (1/2) [sin (a+b) - sin (a-b) ]

    So simply plug it into that, to get-

    (1/2) [sin (2x+5x) - sin (2x-5x) ]
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