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P is the point on the parabola y^(2)=4ax...

P is the point on the parabola `y^(2)=4ax(a>0)` whose vertex is A .PA produced to meet the directrix in D and M is the foot of perpendicular from P on the directrix. If a circle is described on MD as a diameter, then its intersect x -axis at a point whose coordinates are

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