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A(-2, 0) and B(2, 0) are fixed. A point P sees AB at a right angle. P lies on
Ax² + y² = 4
Bx² + y² = 2
Cx² - y² = 4
Dy² = 8x
Answer & Solution
Correct answer: A. x² + y² = 4
Slopes multiply to -1: y²/(x² - 4) = -1, so x² + y² = 4, the circle with AB as diameter.
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