Question: he expression sin (x +y ) + sin(x -y ) is equal to 2 sin r sin y 2 sin x cos y 2 cos

he expression sin (x +y ) + sin(x -y ) is

equal to 2 sin r sin y 2 sin x cos y

he expression sin (x +y ) + sin(x -y ) is equal to 2 sin r sin y 2 sin x cos y 2 cos i cos y 2 cos x sin y

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