Definition:Inverse Cosecant/Complex/Definition 2

Definition

Let $z \in \C_{\ne 0}$ be a non-zero complex number.

The inverse cosecant of $z$ is the multifunction defined as:

$\csc^{-1} \left({z}\right) := \left\{{\dfrac 1 i \ln \left({\dfrac {i + \sqrt{\left|{z^2 - 1}\right|} e^{\left({i / 2}\right) \arg \left({z^2 - 1}\right)}} z}\right) + 2 k \pi: k \in \Z}\right\}$

where:

$\sqrt{\left|{z^2 - 1}\right|}$ denotes the positive square root of the complex modulus of $z^2 - 1$

$\arg \left({z^2 - 1}\right)$ denotes the argument of $z^2 - 1$

$\ln$ denotes the complex natural logarithm considered as a multifunction.

Also see

• Equivalence of Definitions of Complex Inverse Cosecant Function

• Definition:Inverse Hyperbolic Cosecant/Complex/Definition 2

• Definition:Complex Arccosecant