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# cos

(PHP 4, PHP 5)

cosCosine

### Описание

float cos ( float \$arg )

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

arg

### Возвращаемые значения

The cosine of arg

### Примеры

Пример #1 cos() example

```<?php echo cos(M_PI); // -1 ?>```

### Смотрите также

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)); ?>```