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Auxiliary circle of x²/a² + y²/b² = 1?

Ax² + y² = b²
Bx² + y² = a² − b²
Cx² + y² = a²
Dx² + y² = a² + b²
Answer & Solution
Correct answer: C. x² + y² = a²
The auxiliary circle has the major axis as its diameter, so its radius is a.
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