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RegionPlot

Plots the region where an inequality holds.

$ wo 'Head[RegionPlot[x^2 + y^2 < 1, {x, -1, 1}, {y, -1, 1}]]'
Graphics

A list of conditions plots one region per condition, each in its own color. All Graphics options apply.

$ wo 'Head[RegionPlot[{y > x/2 + 1, y < 3 x/2 - 1}, {x, -5, 5}, {y, -5, 5}, GridLines -> Automatic, Axes -> True, AxesOrigin -> {0, 0}, AxesStyle -> Thick, Frame -> False]]'
Graphics