Circular function and Secant

Circular function noun - Function of an angle expressed as a ratio of the length of the sides of right-angled triangle containing the angle.

Secant and circular function are semantically related. In some cases you can replace term "Secant" with "Circular function", this terms are similar.

Secant noun - Ratio of the hypotenuse to the adjacent side of a right-angled triangle.

Circular function and secant are semantically related. You can use "Circular function" instead a noun "Secant".