Definition:Hyperbolic Tangent/Definition 1
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Definition
The hyperbolic tangent function is defined on the complex numbers as:
- $\tanh: X \to \C$:
- $\forall z \in X: \tanh z := \dfrac {e^z - e^{-z} } {e^z + e^{-z} }$
where:
- $X = \set {z : z \in \C, \ e^z + e^{-z} \ne 0}$
Also see
- Definition:Hyperbolic Sine
- Definition:Hyperbolic Cosine
- Definition:Hyperbolic Cotangent
- Definition:Hyperbolic Secant
- Definition:Hyperbolic Cosecant
Sources
- 1981: Murray R. Spiegel: Theory and Problems of Complex Variables (SI ed.) ... (previous) ... (next): $2$: Functions, Limits and Continuity: The Elementary Functions: $5$
- Weisstein, Eric W. "Hyperbolic Tangent." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/HyperbolicTangent.html