In mathematics, the Gudermannian function relates a hyperbolic angle measure ψ {\textstyle \psi } to a circular angle measure ϕ {\textstyle \phi } called the gudermannian of ψ {\textstyle \psi } and denoted gd ψ {\textstyle \operatorname {gd} \psi } . The Gudermannian function reveals a close relationship between the circular functions and hyperbolic functions.
In mathematics, the Gudermannian function relates a hyperbolic angle measure ψ {\textstyle \psi } to a circular angle measure ϕ {\textstyle \phi } called the gudermannian of ψ {\textstyle \psi } and denoted gd ψ {\textstyle \operatorname {gd} \psi } . The Gudermannian function reveals a close relationship between the circular functions and hyperbolic functions.
Source: Wikipedia "Gudermannian function" · CC BY-SA 4.0
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