What is Cosine Function?

The cosine function, denoted as cos(θ), is defined as the ratio of the length of the adjacent side to the length of the hypotenuse in a right-angled triangle.

[Tex] \cos(\theta) = \frac{\text{adjacent}}{\text{hypotenuse}} [/Tex]

Finding the cosine of common angles is a fundamental aspect of trigonometry, it is important for solving various mathematical and real-world problems involving angles and triangles. Common angles such as 0°, 30°, 45°, 60°, and 90° have specific cosine values that are frequently used in calculations.

In this article we will learn different methods to find the cosine of some common angles.