acos
(PHP 4, PHP 5, PHP 7, PHP 8)
acos — 反余弦
说明
acos(float
$arg): float
返回 arg 的反余弦值，单位是弧度。acos()
是 cos() 的反函数，它的意思是在
acos() 范围里的每个值都是
a==cos(acos(a)) 。
参数
-
arg -
要处理的参数
返回值
arg 的反余弦弧度。
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User Contributed Notes 1 note
rahmatjon at gmail dot com ¶
1 year ago
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/>";
?>