(PHP 3, PHP 4, PHP 5)
tan() returns the tangent of the arg parameter. The arg parameter is in radians.
arg
Пример 1. tan() example
<?php echo tan(M_PI_4); // 1 ?>
See also: atan(), sin(), cos(), and deg2rad().
To find cotangent you can use tan (M_PI/2 - $alfa)
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