abs | arccos | arcsin | arctan | arg |

binom | ceil | cos | cosh | exp |

floor | gamma | if | ln | max |

min | product | round | sgn | sin |

sinh | sqrt | square | sum | tan |

tanh |

Points to remember:

- the arguments of a function must always be enclosed in parentheses, e.g. "sin(x)", not "sin x".
- "x*y" can be written as "x y" but not "xy"
- "a^b" is defined in the following cases:
- a > 0 and any b (unless the number becomes too large)
- a = 0 and b >= 0 (with the convention 0^0 = 1)
- a < 0 and b an integer (unless the number becomes too large)