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cos

(PHP 4, PHP 5)

cosCosine

Description

float cos ( float $arg )

cos() returns the cosine of the arg parameter. The arg parameter is in radians.

Parameters

arg

An angle in radians

Return Values

The cosine of arg

Examples

Example #1 cos() example

<?php

echo cos(M_PI); // -1

?>

See Also


User Contributed Notes
cos
bruha at las wegos dot net
10-Aug-2008 02:45
Another way to figure out a triangle (more efficient)

<?php
$a
= 10; // a
$b = 15; // b

$angle = 45 // angle opposite side c

$c = (sqrt(pow($a, 2) + pow($b, 2) - $a * $b * cos(deg2rad($angle)) * 2));

// side c = 10.613894770933
?>

yes im good arent i?
joescuriosityshoppe at gmail dot com
13-Oct-2006 09:55
Find the side of a triangle using two sides and an angle:
<?
$a
= "10"; // length of side a
$b = "15"; // length of side b
$angle = "45" // angle opposite side c

$c = (sqrt(pow($a, 2) + pow($b, 2) - $a * $b * cos(deg2rad($angle)) * 2));

// side c = 10.613894770933
?>
felipensp at gmail dot com
12-Mar-2006 01:29
Convert degree to radianus, radianus to cos.

<?php

   
// Degree
   
$degree = 360;

   
// Convertion
   
print cos(deg2rad($degree));

?>
 

 
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