asin

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

asin反正弦

说明

asin(float $num): float

返回 num 的反正弦值,单位是弧度。asin()sin() 的反函数,它的意思是对于 asin() 的定义域中的每个 num 值,$num == sin(asin($num))

参数

num

待处理的参数

返回值

num 的反正弦弧度。

参见

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User Contributed Notes 1 note

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rahmatjon at gmail dot com
3 years ago
Hello!
Please put this example below the asin() function's description.
Thank you!

Example:
<?php
    $arg
= 0.5;
   
$val = asin($arg);
    echo
"asin(" . $arg . ") = " . $val . " radians.<br/>";
    echo
"Pi value = " . pi() . "<br/>";  
    echo
"asin(" . $arg . ") = " . $val/pi()*180 . " degrees<br/>";

   
$arg = 1;
   
$val = asin($arg);
    echo
"asin(" . $arg . ") = " . $val . " radians.<br/>";
    echo
"Pi value = " . pi() . "<br/>";  
    echo
"asin(" . $arg . ") = " . $val/pi()*180 . " degrees<br/>";
?>
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