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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 `2sqrt(6)` , then the values of `mu` are (a)`+-2` (b) `+-3` (c) `+-4` (d) none of these

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