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Tongent and normal drawn to a parabola a...

Tongent and normal drawn to a parabola at `A(a t^2,2a t),t!=0` meet the x-axis at point `Ba n dD` , respectively. If the rectangle `A B C D` is completed, then the locus of `C` is `(a)y=2a` (b) `y+2a=c` `(c)x=2a` (d) none of these

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