A function is used in an expression to call a predetermined operation to be performed in an operand They must be used in conjunction with either a statement or a command Examples are shown in table below

Functions | Meaning |
---|---|

SIN (x) | The sign of x |

Cos (x + y) | The cosine of the addition of x and y |

TAN (x – y) | The tangent of subtraction of y from x |

ATN (x) | Arctangent of x |

EXP (x) | The exponential value of x |

LOG (x) | The natural logarithm of x |

SQR (x) | The square root of x |

ABS (x) | The absolute value of x |

SPC (x) | Leave x space |

TAB (x) | Start at position x + 1 |

SGN (x) | The sign of x; 1 if x > 0, 0 if x = 0, -1 if x < 0 |

**Note**: The quantity x is called the argument or parameter