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If the length of the common chord of two...

If the length of the common chord of two circles `x^2 +y^2+8x+1=0` and `x^2 +y^2+2muy-1=0` is `2sqrt6`, then the value of `mu` is

A

1) `+-2`

B

2) `+-3`

C

3) `+-4`

D

4) none of these

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