If sin alpha +beta|cos alpha -beta=tanπ|4 - alpha=m×cotπ|4 - beta
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α+β+γ=2π
⇒2α+β+γ=π
⇒1−tan2αtan2β−tan2βtan2γ−tan2γtan2αtan2α+tan2β+tan2γ−tan2αtan2βtan2γ=0
⇒tan2α+tan2β+tan2γ=tan2αtan2βtan2
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