Cosine

Cosine is a mathematical function that measures the angle's relationship to a circle, specifically in a right triangle or on the unit circle. Imagine a point moving around a circle; the cosine of an angle is the horizontal distance from the center to that point. It helps describe how values change with angles, especially in waves, oscillations, and signals. Cosine ranges between -1 and 1, reflecting how far along the horizonal axis the point is at a given angle. It's fundamental in trigonometry, physics, engineering, and many fields involving periodic phenomena.