Math
PHP Manual

atan

(PHP 4, PHP 5)

atan — Arc tangent

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.

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Math
PHP Manual