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A variable line L intersects the parabol...

A variable line `L` intersects the parabola `y=x^(2)` at points `P` and `Q` whose `x`- coordinate are `alpha` and `beta` respectively with `alpha lt beta` the area of the figure enclosed by the segment `PQ` and the parabola is always equal to `4/3`. The variable segment `PQ` has its middle point as `M`
Which of the following is/are correct?

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