.------------------------------------------------------------------------------------------------.
 | Type an equation above, or click below. | Any javascript expression that evaluates to a number |
 |-----------------------------------------| or array of numbers is graphable, and everything in  |
 | sin(x * x) / x                          | Math is available as a local variable.               |
 | floor(x)                                |------------------------------------------------------.
 | random() * 4 - 2                        |                                                       
 | [x = (random() + x), x - 1]             |                                                       
 | [cos(x), sin(x) + 1]                    |                                                       
 | cos(random() + x)                       |                                                       
 .-----------------------------------------.