If A,B,C are the angles off `DeltaABC`, then `cotA*cotB+cotB*cotC+cotC – InterviewSolution

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1.	If A,B,C are the angles off `DeltaABC`, then `cotAcotB+cotBcotC+cotC*cotA`=
Answer» Correct Answer - B Given, `A+B+C=pi` `rArrA+B+pi-C` `rArrcot(A+B)=cot(pi-C)` `rArr(cotAcotB-1)/(cotA+cotB)=-cotC` `rArrcotAcotB-1=-cotAcotC-cotBcotC` `rArrcotAcotB+cotBcotC+cotCcotA=1`

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