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The length of the common chord of the tw...

The length of the common chord of the two circles `(x-a)^2+y^2=a^2` and `x^2+(y-b)^2=b^2` is

A

1) `(ab)/sqrt(a^2+b^2)`

B

2) `(2ab)/sqrt(a^2+b^2)`

C

3) `(a+b)/sqrt(a^2+b^2)`

D

4) `sqrt(a^2+b^2)`

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