acos
acos
(PHP 4, PHP 5, PHP 7)
acos — Arc cosine
Description
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.
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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