Question: The equation x2 - xy + y2 = 3 represents a rotated ellipse, that is, an ellipse whose axes are not parallel to the coordinate

The equation x2 - xy + y2 = 3 represents a "rotated ellipse," that is, an ellipse whose axes are not parallel to the coordinate axes. Find the points at which this ellipse crosses the -axis and show that the tangent lines at these points are parallel.

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