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tan(A)/(2)tan(B)/(2)+tan(B)/(2)tan C+tan...

tan(A)/(2)tan(B)/(2)+tan(B)/(2)tan C+tan C tan(R)/(2)=1

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v) tan(A/2)tan(B/2)+tan(B/2)tan(C/2)+tan(C/2)tan(A/2)=1

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tan((A)/(2))tan((B)/(2))+tan((B)/(2))tan((C)/(2))+tan((C)/(2) ))tan((A)/(2))=1