PHP cos() Function

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));
?>

Definition and Usage

The cos() function returns the cosine of a number.

Note: The cos() function returns a numeric value between -1 and 1, which represents the cosine of the angle.

cos( number);

Parameter	Description
number	Required. Specifies a number