How does ( math. acos, atan, sin, cos, tan) work in-depth

How to use the ACOS function

Java: How can I programmatically solve trigonometrical identities? - Quora

How to write all trigonometric functions(sinθ, cosθ, tanθ) in LaTeX?

Function List

Inverse Sin, Cos, Tan, PDF, Sine

Modelica.Math

Sin Cos Tan

Small-angle approximation - Wikipedia

CSS types.acos() Function - GeeksforGeeks