Past exam of the mathematics course of the University of Cambridge / 2022 / ia / Paper 1 / 1B / a / iii / Solution Created 2026-09-24 Updated 2026-09-25
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By the focal definition of an ellipse, the solution set is the ellipse with foci and . Its centre is , its major axis lies along the line through the foci, and its semiaxes are
(1)
The sketch is consequently a nondegenerate ellipse symmetric about both the focal line and its perpendicular bisector.
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