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26 May, 00:05

True or false sin x cos y=1/2 (sin (x+y) + sin (x-y))

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  1. 26 May, 00:16
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    Step-by-step explanation:

    hello:

    sin (x+y) = sinxcosy+cosxsiny ... (*)

    sin (x-y) = sinxcosy-cosxsiny ... (**)

    add (*) and (**) : sin (x+y) + sin (x-y) = 2sinxcosy

    1/2 (sin (x+y) + sin (x-y)) = sinxcosy ... true
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