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A point on a parabola y^2=4a x , the foo...

A point on a parabola `y^2=4a x ,` the foot of the perpendicular from it upon the directrix, and the focus are the vertices of an equilateral triangle. The focal distance of the point is equal to `a/2` (b) `a` (c) `2a` (d) `4a`

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