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  4. If t1 and t2 be the parameters of the end points of a focal chord for the parabola y2 = 4ax, then which one is true ?

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Q. If $t_1$ and $ t_2$ be the parameters of the end points of a focal chord for the parabola $ y^2 = 4ax,$ then which one is true ?

Conic Sections

Solution:

$ t_1 t_2= -1$