1.

If p_(1), p_(2), p_(3) are respectively the perpendiculars from the vertices of Delta ABC to the opposite sides, then (cos A)/p_(1)+ (cos B)/p_(2) + (cos C)/p_(3) =

Answer»

`1/r`
`1/R`
`1/r_(1)`
`1/r_(3)`

ANSWER :B


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