Show, using algebra, that the formula  for a circle  is a special case of the formula  for an ellipse.

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The formula for a circle is `(x-h)^2+(y-k)^2=r^2` where the center of the circle is at (h,k) and the radius is r.

The formula for an ellipse is `((x-h)^2)/a^2+((y-k)^2)/b^2=1` where (h.k) is the center of...

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