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

P is a point(a,b) in the first quadrant. If the two circles which pass through P and touch both the co-ordinates axes cut at right angles , then

A

`a^2-6ab+b^2=0`

B

`a^2+2ab-b^2=0`

C

`a^2-4ab+b^2=0`

D

`a^2-8ab+b^2=0`

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