Question: Which compound angle expression is equivalent to cos xcosy - sin x siny? a) sin(x - y) b) cos(x - y) O c) sin(x +

Which compound angle expression is equivalent to cos xcosy - sin

Which compound angle expression is equivalent to cos xcosy - sin x siny? a) sin(x - y) b) cos(x - y) O c) sin(x + y) O d) cos (x + y)

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