Cotangent: ['k? u'si:k？ nt]

Sec is short for secant. Csc is short for cosecant.

Secant is the ratio of the hypotenuse of an acute angle to its adjacent side in a right triangle (that is, the hypotenuse of angle A is closer to its adjacent side), which is called the secant of this acute angle. Cosecant csc is the abbreviation of Cosecant, pronounced [,k is not? sē？ Kant]. Cotangent is the ratio of the hypotenuse to the opposite side of an acute angle in a right triangle, expressed by csc (angle).

trigonometric function

It is one of the basic elementary functions, with angle (the most commonly used radian system in mathematics, the same below) as the independent variable, and the angle corresponding to the coordinates where the terminal edge of any angle intersects with the unit circle or its ratio as the dependent variable. It can also be equivalently defined as the lengths of various line segments related to the unit circle. Trigonometric function plays an important role in studying the properties of geometric shapes such as triangles and circles, and is also a basic mathematical tool for studying periodic phenomena.