Theory of Intelligence
11TH•Mathematics•Trigonometric Identities•Question 7

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cot⁡(α+β)=cot⁡αcot⁡β−1cot⁡α+cot⁡β\cot(\alpha + \beta) = \dfrac{\cot\alpha \cot\beta - 1}{\cot\alpha + \cot\beta}

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