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Pis a point on the parabola y^2 =4ax(a l...

Pis a point on the parabola `y^2 =4ax(a lt 0)` whose vertex is A. PA is produced to meet the directrix in M is the foot of the perpendicular from P on the directrix. If a circle is described on MD as a diameter then it intersects the x-axis at a point whose co-ordinates are:

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