If you use OS X, then you own an application that’ll waste hours of your time. And it’s just sitting on your hard drive.
Say hello to Applications > Utilities > Grapher.
We needed a simple Fourier square wave for a book. Just type in the equations, and out it pops.
But the time wasting comes from playing with its example graphs.
Did I mention that they animate, and it can export Quicktime?
Please keep it clean, respectful, and relevant.
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