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==Theorem==
The following formula holds:
$$\mathrm{tanh}(\mathrm{gd}^{-1}(x))=\sin(x),$$
where $\mathrm{tanh}$ denotes the [[tanh|hyperbolic tangent]], $\mathrm{gd}^{-1}$ denotes the [[inverse Gudermannian]], and $\sin$ denotes [[sine]].

==Proof==

==References==

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

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