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==Theorem==
The following formula holds:
$$\tan(\mathrm{gd}(x))=\sinh(x),$$
where $\tan$ denotes [[tangent]], $\mathrm{gd}$ denotes the [[Gudermannian]], and $\sinh$ denotes the [[sinh|hyperbolic sine]].

==Proof==

==References==

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

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