" 7."ln Delta ABC,r(cot(A)/(2)+cot(B)/(2...

" 7."ln Delta ABC,r(cot(A)/(2)+cot(B)/(2)+cot(C)/(2))=

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In any Delta ABC,cot((A)/(2)),cot((B)/(2)),cot((C)/(2)) are in A.P.

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