sin 2 a / 1 - cos 2 a = Cot A
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cot(theta) = 1/ tan(theta) = b / a ... cot^2(x) + 1 = csc^2(x). sin(x y) = sin x cos y cos x sin ... cos(2x) = cos^2(x) - sin^2(x) = 2 cos^2(x) - 1 = 1 - 2 sin^2(x). tan(2x) = 2 .
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