Constitution Cycloid
The cycloid constitution is the result of the development of a system of critoforms, consisting of two complex closed concentric curves having a common point. Graphs of periodic functions (trigonometric functions) are special cases of criform cycle curves. The general properties of curves of the 2nd kind are: - the presence of real points (nodes), - their obertangents lie in the curves, - symmetry with respect to the bisector of the I and III quadrants