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JEE Advance - Mathematics (1994 - No. 16)

Which one of the following curves cut the parabola $${y^2} = 4ax$$ at right angles?
$${x^2} + {y^2} = {a^2}$$
$$y = {e^{ - x/2a}}$$
$$y = ax$$
$${x^2} = 4ay$$

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