![]() You can copy the Grapher equation as a PDF graphic by right-clicking on it and choosing the appropriate selection from the contextual menu that pops up. You can enter maths in a natural way similar to TeX as the typed "infinity" shows, the syntax is sometimes different from TeX, but if you can't guess a keyword there's always the pallette at the bottom right. It's free and can be used as an input device for math formulas, as this screenshot shows: On a recent Mac, use the pre-installed Grapher in /Applications/Utilities/. If you're a teacher, definitely give this a try! Annotated graphs can be copied to the clipboard and pasted into your presentation. The equations are rendered as bitmaps with rather low resolution, but the program and its general approach are well-suited for middle- and high-school students.
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