If a double ordinate of the parabola \( y^{2}=4 a x \) is a length \( 8 a \), then the angle bet...

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If a double ordinate of the parabola \( y^{2}=4 a x \) is a length \( 8 a \), then the angle between the lines joining the vertex of the parabola to the ends of this double ordinate is
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