How to get the cotangent?

Excuse me, could you please elaborate on how one might go about obtaining the cotangent of an angle in a mathematical or trigonometric context? I understand that the cotangent is a trigonometric function, but I'm curious about the specific steps or formulas involved in calculating it. Is there a straightforward way to derive the cotangent from other trigonometric functions, such as sine or cosine? Additionally, are there any real-world applications where the cotangent function plays a significant role? I'd appreciate any insights or guidance you could provide on this topic.