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What is the director circle of x² + y² = a²?
Ax² + y² = a²
Bx² + y² = 2a²
Cx² + y² = a²/2
Dx² + y² = 4a²
Answer & Solution
Correct answer: B. x² + y² = 2a²
Perpendicular tangents give m₁m₂ = −1, which leads to x² + y² = 2a².
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