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The equations of two circles are x^(2)+y...

The equations of two circles are `x^(2)+y^(2)+2 lambda x+5=0` and `x^(2)+y^(2)+2 lambda y+5=0` .P is any point on the line x-y=0 .If PA and PB are the lengths of the tangents from P to the two circles and PA=3 them PB=

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