Cos(x)

Definition

The cosine function relates an angle (in radians) to its x-coordinate on the unit circle. It also oscillates between -1 and 1, but starts from 1 instead of 0 like sin(x).

Related terms

Unit circle: A circle with a radius of 1 unit, often used to define trigonometric functions.

Trigonometric identities: Equations that relate different trigonometric functions to each other.

Periodicity: The property of a function that repeats itself after a certain interval.