Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Cos(t) is a trigonometric function that represents the ratio between the adjacent side and hypotenuse in a right triangle with angle t (measured in radians).
Related terms
Sine function: A trigonometric function that represents the ratio between the opposite side and hypotenuse in a right triangle with angle t.
Periodic function: A function that repeats its values at regular intervals.
Radians: A unit of measurement for angles, where one radian is equal to the angle subtended by an arc of length equal to the radius of a circle.