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

(iii)

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(iii)

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

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