cot(x - y): = a Reciprocal Identity, and then use a Subtraction Formula. 1 cot(x - y) = COL(x) col(y) + 1 cot(y) - cot(x) 11 || tan a Reciprocal Identity, and then simplify the compound fraction. 1 1 + (cot(x)) (cot(y)) tan(x) - tan(y) + tan(x) tan(y) 1 cot(x) cot(x) cot(y) cot(y) - cot(x) cot(x) cot(y) 1 cot(y)

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