Cotangent of the sum of two angles

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Trigonometry

The cotangent of the sum of two angles equals the product of the cotangents of the angles minus 1 divided by the sum of the cotangents of the two angles

\cot(\alpha+\beta) = \dfrac{\cot \alpha\cot \beta-1 }{\cot \alpha+\cot \beta}

or

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