srand
Workaround for cotangent function
<?php
//FOR PHP 4
function cot($rad)
{
return tan(M_PI_2 - rad2deg($rad));
}
//FOR PHP 3
function cot($rad)
{
return tan(M_PI/2 - rad2deg($rad));
}
?>
tan
(PHP 4, PHP 5)
tan — Tangent
Description
float tan
( float
$arg
)
tan() returns the tangent of the arg
parameter. The arg parameter is in radians.
Parameters
-
arg -
The argument to process in radians
Return Values
The tangent of arg
Examples
Example #1 tan() example
<?php
echo tan(M_PI_4); // 1
?>
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User Contributed Notes
tan
georgedot at gmail dot com
10-Sep-2009 08:50
fformula at gmail dot com
10-Apr-2006 12:26
To find cotangent you can use
tan (M_PI/2 - $alfa)