Apache.RU - Russian Apache Web-Server

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() - Cosine
acosh() - Inverse hyperbolic cosine
asin() - Arc sine
atan() - Arc tangent