Let \( x^{2}+y^{2}-4 x-2 y-11=0 \) be a circle. A pair of tangents ...

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Let \( x^{2}+y^{2}-4 x-2 y-11=0 \) be a circle. A pair of tangents from the point \( (4,5) \) with a pair of radii form a
\( \mathrm{P} \) quadrilateral of area... .
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