State the sum and difference formulas for the cosine. cos (x + y) = cos (x) cos (y) - sin (y) sin(x) cos (x - y) = sin (x) cos (y) - sin (y) cos(x) cos (x + y) = sin (x) cos (y) + sin (y) cos(x) cos (x - y) = cos (x) cos (y) + sin (y) sin(x)

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