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Which gives the coordinates of a general point on the parabola x² = 4ay?
A(at, at²)
B(2at, at²)
C(2at, 2at²)
D(at², 2at)
Answer & Solution
Correct answer: B. (2at, at²)
Putting x = 2at gives x² = 4a²t², so y = at² satisfies x² = 4ay.
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