Cotangent (Cot) is one of the trigonometric ratios that are widely used in mathematics, astronomy, and physics, and used to be called darkness.< < > this trigonometric ratio is defined as: the ratio of the adjacent side of any acute angle to the opposite side of en.< < - > the cotangent function is a function alternating with the periodicity of pi. Infinitely asymptotes have and no continuity.