... and graph it too!
Basically, it takes your equation, renders it on the screen, and creates a short sound sample of how the equation sounds.
I use fooplot), an open-source home-made graphing utility to plot the graph. It also parses the equation and filters out a lot of possible bogus answers.
Next, a 2-second plain ole Array filled with sampled data is created manually by plugging in numbers for the 2-second range. This array of length 88200 is rendered by HTML5's Audio Context.