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PHP Quiz PHP CertificatePHP cos() Function
Complete PHP Math Reference
Definition and Usage
The cos() function returns the cosine of a number.
Syntax
cos(x)
| Parameter | Description |
|---|---|
| x | Required. A number |
Tips and Notes
Note: The cos() function returns a numeric value between -1 and 1, which represents the cosine of the angle.
Example
In the following example we will return the cosine of different numbers:
<?php
echo(cos(3) . "<br />");
echo(cos(-3) . "<br />");
echo(cos(0) . "<br />");
echo(cos(M_PI) . "<br />");
echo(cos(2*M_PI))
?>
echo(cos(3) . "<br />");
echo(cos(-3) . "<br />");
echo(cos(0) . "<br />");
echo(cos(M_PI) . "<br />");
echo(cos(2*M_PI))
?>
The output of the code above will be:
-0.9899924966004454
-0.9899924966004454
1
-1
1
-0.9899924966004454
1
-1
1
Complete PHP Math Reference
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