The general equation for an ellipse is \[\frac{(x-h)^2}{a^2} + \frac{(y-k)^2}{b^2} = 1\]
where (h,k) is the center of the ellipse, a is the half-width (semi-major axis), and b is the half-height (semi-minor axis). In this case, the center of the ellipse is at the
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