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

==Proof==

==References==

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

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