1.

In DeltaABC" prove that " (r_(1))/(bc)+(r_(2))/(ca)+(r_(3))/(ab)=(1)/(r)-(1)/(2R)

Answer»

`(1)/(R)-(1)/(2R)`
`1+(r)/(R)`
`2+(r)/(2R)`
`1-(r)/(2R)`

ANSWER :A


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