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18 April, 11:43

Sinxcos y = 1 (sin (x + y) + sin (x-y))

sin x COSY -

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  1. 18 April, 12:50
    0
    Step-by-step explanation:

    sin (x+y) = sin x cos y+cos x sin y

    sin (x-y) = sin x cos y-cos x sin y

    add

    sin (x+y) + sin (x-y) = 2 sin x cos y

    sin x cos y=1/2 [sin (x+y) + sin (x-y) ]
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