1.

If 't_(1)' , 't_(2)' and 't_(3)' are the lengths of the tangents draen from centre of x-circle to the circumcircle of the DeltaABC, then (1)/(t _(1)^(2))+(1)/(t _(2)^(2))+(1)/(t_(3)^(2)) is equal to

Answer»

`(ABC)/(a+B+c)`
`(a+b+c)/(abc)`
`(a+b+c)/(2ABC)`
`(2 abc)/(a+b+c)`

ANSWER :B


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