1.

If P_(1),P_(2),P_(3) are altitudes of a DeltaABC then show that (1)/(P_(1))+(1)/(P_(2))-(1)/(P_(3))=(1)/(r_(3))

Answer»

`1/r`
`1/r_(1)`
`1/r_(2)`
`1/r_(3)`

ANSWER :D


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