Definition:Inverse Tangent/Complex/Definition 2
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Definition
Let $S$ be the subset of the complex plane:
- $S = \C \setminus \set {0 + i, 0 - i}$
The inverse tangent is a multifunction defined on $S$ as:
- $\forall z \in S: \tan^{-1} \paren z := \set {\dfrac 1 {2 i} \ln \paren {\dfrac {i - z} {i + z} } + k \pi: k \in \Z}$
where $\ln$ denotes the complex natural logarithm as a multifunction.
Also defined as
This concept is also reported as:
- $\tan^{-1} \paren z := \set {\dfrac 1 {2 i} \ln \paren {\dfrac {1 + i z} {1 - i z} } + k \pi: k \in \Z}$