Cosine Function

The three common trigonometry functions are tangent, sine and cosine.

You may use want to use some mnemonics to help you remember the trigonometric functions. One common mnemonic is to remember the SOH-CAH-TOA.

In this lesson, we consider the cosine function.

The cosine of an angle is the ratio of the adjacent side and hypotenuse side.

Cosine is usually abbreviated as cos. Cosine q can be written as cos q .

Example:

Calculate the value of cos q in the following triangle.

Solution:

Have a look at the following video for more examples on the cosine function:

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