Difference between revisions of "Relationship between sine, Gudermannian, and tanh"
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Latest revision as of 07:35, 8 June 2016
Theorem
The following formula holds: $$\sin(\mathrm{gd}(x))=\tanh(x),$$ where $\sin$ denotes the sine, $\mathrm{gd}$ denotes the Gudermannian, and $\tanh$ denotes the hyperbolic tangent.
