Руководство по PHP
Пред. |  | След.

# atan

(PHP 3, PHP 4, PHP 5)

atan -- Arc tangent

## Description

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.

See also: atanh(), asin(), and acos().

Пред. | Начало | След.
atan2 | Уровень выше | atanh