# Operators, Functions, and Constants

When you use trigonometric functions in equations, specify the angular units by selecting Degrees or Radians in Angular Equation Units in the Equations dialog box.

Name | Notes | |
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Operator |
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+ | plus sign | addition |

- | minus sign | subtraction |

* | asterisk | multiplication |

/ | forward dash | division |

^ | caret | exponentiation |

Function |
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sin (a) | sine | a is the angle; returns the sine ratio |

cos (a) | cosine | a is the angle; returns the cosine ratio |

tan (a) | tangent | a is the angle; returns the tangent ratio |

sec (a) | secant | a is the angle; returns the secant ratio |

cosec (a) | cosecant | a is the angle; returns the cosecant ratio |

cotan (a) | cotangent | a is the angle; returns the cotangent ratio |

arcsin (a) | inverse sine | a is the sine ratio; returns the angle |

arccos (a) | inverse cosine | a is the cosine ratio; returns the angle |

atn (a) | inverse tangent | a is the tangent ratio; returns the angle |

arcsec (a) | inverse secant | a is the secant ratio; returns the angle |

arccosec (a) | inverse cosecant | a is the cosecant ratio; returns the angle |

arccotan (a) | inverse cotangent | a is the cotangent ratio; returns the angle |

abs (a) | absolute value | returns the absolute value of a |

exp (n) | exponential | returns e raised to the power of n |

log (a) | logarithmic | returns the natural log of a to the base e |

sqr (a) | square root | returns the square root of a |

int (a) | integer | returns a as an integer |

sgn (a) | sign | returns the sign of a as -1 or 1
For example: sgn(-21) returns -1 |

Constant |
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pi | pi | ratio of the circumference to the diameter of a circle (3.14...) |