PHP K�sikirja
Edellinen |  | Seuraava

# 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().

Edellinen | Alkuun | Seuraava
atan2 | Ylös | atanh