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==Theorem==
The following formula holds:
$$\mathrm{csch}(\mathrm{gd}^{-1}(x))=\cot(x),$$
where $\mathrm{csch}$ is the [[csch|hyperbolic cosecant]], $\mathrm{gd}^{-1}$ is the [[inverse Gudermannian]], and $\cot$ is the [[cotangent]].

==Proof==

==References==

[[Category:Theorem]]
[[Category:Unproven]]

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