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The circles (x+a)^(2)+(y+b)^(2)=a^(2) an...

The circles `(x+a)^(2)+(y+b)^(2)=a^(2)` and `(x+alpha)^(2)+(y+beta)^(2)=beta^(2)` cut orthogonally if ………..

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The correct Answer is:
`2(a alpha+b beta)=beta^(2)+alpha^(2)`
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