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If a double ordinate of the parabola y2 = 4ax is a length 8a, then the angle between the lines joining the vertex of the parabola to the ends of this double ordinate is __________. |
| Answer» If a double ordinate of the parabola y2 = 4ax is a length 8a, then the angle between the lines joining the vertex of the parabola to the ends of this double ordinate is __________. | |