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Let P and Q be two distinct points on the parabola y2=4x, with parameters t and t1 respectively. If the normals at P passes through Q, then the minimum value of t21 is

Answer» Let P and Q be two distinct points on the parabola y2=4x, with parameters t and t1 respectively. If the normals at P passes through Q, then the minimum value of t21 is


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