👉 The term "cothurnal" refers to a function in calculus, specifically a hyperbolic cosine function. It is used in complex analysis and mathematical physics, particularly in the study of the behavior of certain functions that are related to the gamma function, including the Bessel functions. In mathematics, the cothfunction (also known as the cotangent or cotermian) represents the reciprocal tangent function. The cotangent is defined as follows: cot(x) = 1 / tan(x)
