Difference between revisions of "Relationship between secant, Gudermannian, and cosh"
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Revision as of 22:59, 25 August 2015
Theorem: The following formula holds: $$\sec(\mathrm{gd}(x))=\cosh(x),$$ where $\sec$ denotes the secant, $\mathrm{gd}$ denotes the Gudermannian, and $\cosh$ denotes the hyperbolic cosine.
Proof: █
