Period of sinh
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Theorem
The following formula holds for all $k \in \mathbb{Z}$: $$\sinh(z+2k\pi i)=\sinh(z),$$ where $\sinh$ denotes the hyperbolic sine, $\pi$ denotes pi, and $i$ denotes the imaginary number.
Proof
References
- 1964: Milton Abramowitz and Irene A. Stegun: Handbook of mathematical functions ... (previous) ... (next): $4.5.13$
