# How to Graph the Cosine Function?

Cosine is one of the primary mathematical trigonometric ratios. In this guide, you will learn more about the graph of the cosine function.

**A step-by-step guide to graphing the cosine function**

Cosine is one of the primary mathematical trigonometric ratios. The cosine can be defined as the ratio of the length of the base to the length of the hypotenuse in a right triangle.

\(\color{blue}{cos\:x\:=\frac{Adjacent\:Side}{Hypotenuse}=\frac{Base}{Hypotenuse}\:}\)

where \(x\) is the acute angle between the base and the hypotenuse.

A cosine graph or \(cos\) graph is a top-down graph just like a \(sin\) graph. The only difference between a \(sin\) graph and a \(cos\) graph is that a sine graph starts at \(0\) while a cos graph starts at \(90\) (or \(\frac{\pi }{2})\). The \(cos\) plot given below starts at \(1\) and decreases to \(-1\) and then starts increasing again.

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