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cotBcotC+cotCcotA+cotAcotB=1

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cotBcotC+cotCcotA+cotAcotB=1
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Here , `A+B+C=pi`
`implies (A+B)=(pi-C)`
`implies cot (A+B)=cot (pi-C)=-cot C`
`implies (cot A cot B-1)/(Cot A + cot B)=-cot C`
`impliescot A cot B-1=-cot C cot A- cot B cot C`
`implies cot B cot C + cot C cot A+ cot A cot B=1.`
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