acos

(PHP 4, PHP 5)

acos — Arc cosine

Описание

float acos ( float $arg )

Returns the arc cosine of arg in radians. acos() is the complementary function of cos(), which means that a==cos(acos(a)) for every value of a that is within acos()' range.

Список параметров

arg: The argument to process

Возвращаемые значения

The arc cosine of arg in radians.

Смотрите также

cos()
acosh()
asin()
atan()