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If (x1,y1)and (x2,y2) are ends of a foca...

If `(x_1,y_1)`and `(x_2,y_2)` are ends of a focal chord of `y^2 =4ax,` then values of `x_1x_2` and `y_1y_2` are (A) `a^2 , a^2` (B) `2a^2 ,a^2` (C) `a^2,-4a^2` (D) `a,a`

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