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The equations of two circles are x^2 + ...

The equations of two circles are `x^2 + y^2 + 2lambda x + 5 = 0 and x^2 + y^2 + 2lambda y+ 5 = 0`. P is any point on the line `x-y= 0`. If PA and PB are the lengths of the tangent from Ptothe circles and `PA = 3` then find PB.

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