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The normal at the point (bt1^2, 2bt1) on...

The normal at the point `(bt_1^2, 2bt_1)` on a parabola meets the parabola again in the point `(bt_2^2, 2bt_2)` then :

A

`t_2= -t_1+ 2/t_1`

B

`t_2= t_1-2/t_1`

C

`t_2+2/t_1`

D

`t_2=-t_1-2/t_1`.

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