The equation of the hyperbola whose directrix is P \( x+2 y=1 \), f...

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

W
(1) \( x^{2}-16 x y-11 y^{2}-12 x+6 y+21=0 \)
(2) \( 3 x^{2}+16 x y+15 y^{2}-4 x-14 y-1=0 \)
(3) \( x^{2}+16 x y+11 y^{2}-12 x-6 y+21=0 \)
(4) None of these
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