The equation of the hyperbola whose directrix \( x+2 y=1 \), focus \( (2,1) \) and eccentricity ...
The equation of the hyperbola whose directrix \( x+2 y=1 \), focus \( (2,1) \) and eccentricity 2 , is
(A) \( x^{2}+16 x y-11 y^{2}-12 x+6 y+21=0 \)
(B) \( x^{2}-16 x y-11 y^{2}-12 x+6 y+21=0 \)
(C) \( x^{2}-4 x y-y^{2}-12 x+6 y+21=0 \)
(D) none of these
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