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If A, B, C are three points on the hyperbola `xy=c^2` such that `/_ACB=90^o` and the tangent at C to `xy=c^2` is parallel to `x+3y+5=0`, then the slope of the chord joining AB
A. |
3 |
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B. |
-3 |
C. |
`1/3` |
D. |
`(-1)/3` |