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==Theorem==
The following formula holds:
$$\cosh(\mathrm{gd}^{-1}(x))=\sec(x),$$
where $\cosh$ is the [[cosh|hyperbolic cosine]], $\mathrm{gd}^{-1}$ is the [[inverse Gudermannian]], and $\sec$ is the [[secant]].

==Proof==

==References==

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

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