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A B is a chord of the parabola y^2=4a x ...

`A B` is a chord of the parabola `y^2=4a x` with vertex `AdotB C` is drawn perpendicular to `A B` meeting the axis at `Cdot` The projection of `B C` on the axis of the parabola is `a` (b) `2a` (c) `4a` (d) `8a`

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