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# Prove this

Note by Ashley Shamidha
2 years, 5 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 $$1+\cot A +\cot B=\cot A \cot B$$ · 2 years, 5 months ago