1.

Ifalpha, beta , gammaare the lengthsof the altitudes ofDelta ABC , " then "alpha ^(-2)+beta ^(-2)+gamma^(-2) =

Answer»

` DELTA `
` COT A + cot B +cot C `
` ( cot A + cot B + cot C)/( Delta `
`( Delta )/(cot A+ cot B +cot C) `

ANSWER :C


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