| Allowed inputs | |
|---|---|
| x | the path variable |
| PI | half the cercomference of the unit circle |
| E | mysterious transcindental constant the keeps showing up |
| 123.456 | numerical constants |
| 2 * ( x + 5 ) | +, -, /, *, plus grouping |
| fn( expression ) | where fn is one of: cos, sin, tan, acos, asin, atan, sqrt, exp, ln |
| D( expression ) | take the path derivative of "expression" |
| S( expression ) | take the path integral of "expression" |
| pow( expression1, expression2 ) | expression1 is the base, expression2 is the exponent |