Normals at two points (x1,x2) and (x2,y2...

Normals at two points `(x_1,x_2)` and `(x_2,y_2)` of the parabola `y^2=4x` meet again on the parabola, where `x_1+x_2=4`, then `|y_1+y_2|` is equal to

`sqrt2`

`2sqrt2`

`4sqrt2`

`8sqrt2`

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