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Questions  >>  CBSE XI  >>  Math  >>  Conic Sections
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Find the equation of the circle with centre $(-a,-b)$ and radius $\sqrt {a^2-b^2}$

$\begin{array}{1 1}x^2 +y^2 +2ax+2by+2b^2 \\ x^2 +y^2 +2ax+2by+a^2-b^2 \\ x^2 +y^2 +2ax+2by-2b^2 \\x^2 +y^2 +2ax+2by-a^2+b^2 \end{array} $

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