cos

(PHP 4, PHP 5)

cos — Cosine

Описание

float cos ( float $arg )

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

Список параметров

arg: An angle in radians

Возвращаемые значения

The cosine of arg

Примеры

Пример #1 cos() example

<?php

                
 echo cos(M_PI); // -1

                
 ?>

Смотрите также

acos() - Arc cosine
sin() - Sine
tan() - Tangent
deg2rad() - Converts the number in degrees to the radian equivalent

ceil

cosh

Математические функции

PHP Manual

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));

                
 ?>