# Cosecant function

From Calculus

This article is about a particular function from a subset of the real numbers to the real numbers. Information about the function, including its domain, range, and key data relating to graphing, differentiation, and integration, is presented in the article.

View a complete list of particular functions on this wiki

For functions involving angles (trigonometric functions, inverse trigonometric functions, etc.) we follow the convention that all angles are measured in radians. Thus, for instance, the angle of is measured as .

## Definition

The **cosecant function**, denoted (or sometimes ) is defined as the composite of the reciprocal function and the sine function. Explicitly, it is defined as follows:

The cosecant function is not defined at integer multiples of , because the sine function takes the value zero at these points.

## Key data

Item | Value |
---|---|

default domain | all reals except integer multiples of |

range | , i.e., no absolute minimum value or absolute maximum value. |

period | |

vertical asymptotes | all lines of the form , varying over integers. For even, the left hand limit is and the right hand limit is . For odd, the left hand limit is and the right hand limit is . |

local minimum values and points of attainment | local minimum value of 1, attained at , varying over integers. |

local maximum values and points of attainment | local maximum value of -1, attained at , varying over integers. |

points of inflection | none |

first derivative | |

antiderivative |