acos

(PHP 4, PHP 5, PHP 7, PHP 8)

acos反余弦

说明

acos(float $num): float

返回 num 的反余弦值,单位是弧度。acos()cos() 的反函数,它的意思是对于 acos() 的定义域中的每个 num 值,$num == cos(acos($num))

参数

num

要处理的参数

返回值

num 的反余弦弧度。

参见

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User Contributed Notes 1 note

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-3
rahmatjon at gmail dot com
3 years 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/>";
?>
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