In fact, implicit functions such as that of a circle, an ellipse or a hyperbola are all very good candidates for this. Since Desmos has its interface in Cartesian coordinates by default, it’s only natural that one would use it to plot equations expressed in terms of $x$ and $y$. In which case, just know that the $\le$ symbol can be obtained by typing out and = , again in that order. In some occasions, it might be necessary to use the $\le$ and $\ge$ symbols to define a function accurately. Note that Line 1 and Line 2 are equivalent. Which should produce the following figure: The sign function. The same goes other Greek Letters such as $\alpha$, $\beta$, $\tau$ and $\phi$.
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