1.

If alpha, beta, gamma are lenghts of internal bisectors of angles A,B,C respectively of DeltaABC, then sum (1)/(alpha) "cos" (A)/(2) is

Answer»

a+B+C
`(1)/(a)+(1)/(b)+(1)/(c)`
`2((1)/(a)+(1)/(b)+(1)/(c))`
`2(a+b+c)`

ANSWER :B


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