acos
(PHP 4, PHP 5)
acos — Arc cosine
Описание
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.
Список параметров
- arg
-
The argument to process
Возвращаемые значения
The arc consine of arg in radians.
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Коментарии
Hello!
There is no any example for acos() function. Please put this one below the acos() function's description.
Thank you!
Example:
<?php
$arg=0.5;
$val=acos($arg);
echo "acos(" . $arg . ") = " . $val . " radians.<br/>";
echo "Pi value = " . pi() . "<br/>";
echo "acos(" . $arg . ") = " . $val/pi()*180 . " degrees<br/>";
?>