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P is a point (a , b) in the first quadra...

`P` is a point `(a , b)` in the first quadrant. If the two circles which pass through `P` and touch both the coordinates axes cut at right angles, then `a^2-6a b+b^2=0` `a^2+2a b-b^2=0` `a^2-4a b+b^2=0` `a^2-8a b+b^2=0`

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