asin

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

asinArc sine

Description

asin(float $num): float

Returns the arc sine of num in radians. asin() is the inverse function of sin(), which means that $num == sin(asin($num)) for every value of num that is in the domain of asin().

Parameters

num

The argument to process

Return Values

The arc sine of num in radians

See Also

add a note add a note

User Contributed Notes 1 note

up
0
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/>";
?>
To Top