Cosine Function

Definition

The cosine function is a mathematical function that relates the ratio of the length of the adjacent side to an angle in a right triangle to the length of its hypotenuse. It also oscillates between -1 and 1 as angles change.

Related terms

Sine Function: The sine function is closely related to cosine as it represents ratios involving sides in right triangles.

Tangent Function: Similar to cosine, tangent is another trigonometric function that represents ratios involving sides in right triangles.

Unit Circle: A unit circle is a circle with radius 1 centered at (0,0) on a coordinate plane. It helps visualize trigonometric functions like cosine and sine.