Use ParametricPlot to plot a set of parametric equations:
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ParametricPlot[{2 Cos[t] - Cos[2 t], 2 Sin[t] - Sin[2 t]}, {t, 0,
2 Pi}]
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Make a ContourPlot of a function in multiple variables:
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⨯
ContourPlot[Sqrt[x^2 + y^2], {x, -1, 1}, {y, -1, 1}]
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Use DensityPlot for a continuous version:
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⨯
DensityPlot[Sqrt[x^2 + y^2], {x, -1, 1}, {y, -1, 1}]
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QUICK REFERENCE: Function Visualization »