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cos

(PHP 3, PHP 4, PHP 5)

cos -- Cosine

Description

float cos ( float arg )

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

Пример 1. cos() example

<?php

echo cos(M_PI); // -1

?>

See also: acos(), sin(), tan(), and deg2rad().



add a note add a note User Contributed Notes
cos
joescuriosityshoppe at gmail dot com
13-Oct-2006 02:55
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 05:29
Convert degree to radianus, radianus to cos.

<?php

    // Degree
    $degree = 360;

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

?>
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cosh> <ceil
Last updated: Sat, 27 Jan 2007
 
 
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11 июля 2007
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