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Note by Ashley Shamidha
1 year, 9 months ago

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Expand to get \(1+\cot A +\cot B +\cot A \cot B\).Then use the formula for \(\cot (A+B)\) to find a relation \(1+\cot A +\cot B=\cot A \cot B\) Akshay Bodhare · 1 year, 9 months ago

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Please prove this Ashley Shamidha · 1 year, 9 months ago

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