cos

(PHP 4, PHP 5)

cos — 코사인

설명

float cos ( float $arg )

cos()은 arg 인수의 코사인값을 반환합니다. arg 인자는 라디안 값으로 주어집니다.

Example#1 cos() 예제


<?php

echo cos(M_PI); // -1

?>

참고: acos(), sin(), tan(), deg2rad().

cosh

ceil

Last updated: Sun, 25 Nov 2007

add a note User Contributed Notes
cos

bruha at las wegos dot net
09-Aug-2008 07:45


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 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));



?>

add a note

cosh

ceil

Last updated: Sun, 25 Nov 2007