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" 32."cot(A)/(2)+cot(B)/(2)+cot(C)/(2)=(...

" 32."cot(A)/(2)+cot(B)/(2)+cot(C)/(2)=(s^(2))/(Delta)

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Prove that cot.(A)/(2)+cot.(B)/(2)+cot.(C)/(2)=(s^(2))/(Delta)

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