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The equation of the hyperbola whose dire...

The equation of the hyperbola whose directrix `x+2y=1`, focus `(2,1)` and eccentricity `2`, is

A

`x^(2)+16xy-11y^(2)-12x+6y+21=0`

B

`x^(2)-16xy-11y^(2)-12x+6y+21=0`

C

`x^(2)-4xy-y^(2)-12x+6y+21=0`

D

none of these

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