1.

The chord of contact of tangents from a point 'P' to a circle passes through Q. If l1 and l2 are the lengths of the tangents from P and Q to the circle, then PQ is equal to

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The chord of contact of tangents from a point 'P' to a circle passes through Q. If l1 and l2 are the lengths of the tangents from P and Q to the circle, then PQ is equal to



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