Funcții matematice
PHP Manual

acos

(PHP 4, PHP 5)

acosArc cosine

Descrierea

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.

Parametri

arg

The argument to process

Valorile întoarse

The arc cosine of arg in radians.

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Funcții matematice
PHP Manual