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If the circles, x^2 +y^2 + 2ax + 2by + c...

If the circles, `x^2 +y^2 + 2ax + 2by + c =0 and x^2 +y^2 + 2bx + 2ay + c = 0` where `c lt 0`, have exactly onepoint in common then the value of `(a+b)^2/(2c)` is

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