Definition:Inverse Sine/Complex/Definition 2

Definition
Let $z \in \C$ be a complex number.

The inverse sine of $z$ is the multifunction defined as:
 * $\sin^{-1} \left({z}\right) := \left\{{\dfrac 1 i \ln \left({i z + \sqrt{\left|{1 - z^2}\right|} e^{\frac i 2 \arg \left({1 - z^2}\right)} }\right) + 2 k \pi: k \in \Z}\right\}$

where:
 * $\sqrt{\left|{1 - z^2}\right|}$ denotes the positive square root of the complex modulus of $1 - z^2$
 * $\arg \left({1 - z^2}\right)$ denotes the argument of $1 - z^2$
 * $\ln$ is the complex natural logarithm considered as a multifunction.

Also see

 * Equivalence of Definitions of Complex Inverse Sine Function


 * Definition:Complex Arcsine