The equation of a circle is \( x^{2}+y^{2}-4 x+2 y-4=0 \). With res...

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The equation of a circle is \( x^{2}+y^{2}-4 x+2 y-4=0 \). With respect to the circle
\( \mathrm{P} \)
(a) the pole of the line \( x-2 y+5=0 \) is \( (1,1) \)
W
(b) the chord of contact of real tangents from \( (1,1) \) is the line \( x-2 y+5=0 \)
(c) the polar of the point \( (1,1) \) is \( x-2 y+5=0 \)
(d) none of these
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