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==Theorem==
The following formula holds:
$$\cos(\mathrm{gd}(x))=\mathrm{sech}(x),$$
where $\cos$ denotes the [[cosine]], $\mathrm{gd}$ denotes the [[Gudermannian]], and $\mathrm{sech}$ denotes the [[sech|hyperbolic secant]].

==Proof==

==References==

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

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