acos

(PHP 4, PHP 5, PHP 7)

acos — Arc cosine

Description

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.

Parameters

arg

The argument to process

Return Values

The arc cosine of arg in radians.

See Also

• cos() - Cosine

• acosh() - Inverse hyperbolic cosine

• asin() - Arc sine

• atan() - Arc tangent

← abs

acosh →

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https://secure.php.net/manual/en/function.acos.php