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Описание

float atan ( float $arg )

Returns the arc tangent of arg in radians. atan() is the complementary function of tan(), which means that a==tan(atan(a)) for every value of a that is within atan()'s range.

Список параметров

arg: The argument to process

Возвращаемые значения

The arc tangent of arg in radians.

Смотрите также

tan() - Tangent
atanh() - Inverse hyperbolic tangent
asin() - Arc sine
acos() - Arc cosine