y= x 2, y= - x 2, y= x 2 +3x, y=-3x 2- 4 x- 4, y= -x 2 +2x, y=x 2 + 2 , y= x 2 - x -6, y=-x 2 -3, y= x 2 +4x+6, y=-1x 2 +3x+4, y= x 2 -6x+9, y=-x 2 -4x-4.

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