Find the equation and length of the comm...

Find the equation and length of the common chord of the circles `x^2+y^2-5x-6y+4=0, x^2+y^2-2x-2=0`

A

`sqrt(((a+b)^2-8c)/2)`

B

`sqrt(((a-b)^2-8c)/2)`

C

`sqrt(((a-b)^2+8c)/2)`

D

`sqrt(((a+b)^2+8c)/2)`

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The correct Answer is:

A

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