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The solid lies between planes perpendicular to the x-axis at x = 0 and x = 4.
The solid lies between planes perpendicular to the x-axis at x = 0
and x = 4. The cross-sections perpendicular to the axis on the
interval 0 <= x <= 4 are squares whose diagonals run from the
parabola y = -sqrt(x) to the parabola y = sqrt(x).