The chord of contact of tangents from a ...

The chord of contact of tangents from a point P to a circle passes through Q. If `l_1` and `l_2`are the lengths of the tangents from P and Q to the circle ,then PQ is equal to

`(l_1+l_2)/2`

`(l_1-l_2)/2`

`sqrt(l_1^2+l_2^2)`

`2sqrt(l_1^2+l_2^2)`

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