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calculate cos(x-y) if cos x = 3/5 in Quadrant 4 and tan y = -square root of 3 in Quadrant 2. Calculate cos(x - y)

calculate cos(x-y) if cos x = 3/5 in Quadrant 4 and tan y = -square root of 3 in Quadrant 2.

Calculate cos(x - y) if cos r = 3/5 in Quad. 4 and tany = -V3 in Quad. 2

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