MATH LIBRARY

**Inverse Cosecant**

csc^{-1} | cosec^{-1} |

Csc^{-1} | Cosec^{-1} |

arccsc | arccosec |

Arccsc | Arccosec |

The inverse function of cosecant.

**Basic idea**: In order to find csc^{-1} 2, we ask "what angle has cosecant equal to 2?" The answer is 30°. As a result we say ^{-1} 2 = 30°.^{-1} 2 = π/6.

**More**: There are actually many angles that have cosecant equal to 2. We are really asking "what is the simplest, most basic angle that has cosecant equal to 2?" As before, the answer is 30°. Thus ^{-1} 2 = 30°^{-1} 2 = π/6.

**Details**: What is csc^{-1} (–2)? Do we choose 210°, –30°, 330°, or some other angle? The answer is –30°. With inverse cosecant, we select the angle on the right half of the unit circle having measure as close to zero as possible. Thus ^{-1} (–2) = –30°^{-1} (–2) = –π/6.

In other words, the range of csc^{-1} is restricted to [–90°, 0) U (0, 90°] or . Note: ^{-1}.

Note: arccsc refers to "arc cosecant", or the radian measure of the arc on a circle corresponding to a given value of cosecant.

__Technical note__: Since none of the six trig functionssine, cosine, tangent, cosecant, secant, and cotangent are one-to-one, their inverses are not functions. Each trig function can have its domain restricted, however, in order to make its inverse a function. Some mathematicians write these restricted trig functions and their inverses with an initial capital letter (e.g. Csc or ^{-1}).

**See also**

Inverse trigonometry, inverse trig functions, interval notation

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