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Q)

Find the point of intersection of normals at any two points on the parabola $y^2=4ax$

$\begin{array}{1 1}(a)\;k=-at_1t_2(t_1+t_2)\\(b)\;k=-at_1t_2(t_1-t_2)\\(c)\;k=-at_1t_2(t_2-t_1)\\(d)\;\text{None of these}\end{array}$

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