take the arccosine of a number in php

To take the arccosine of a number in PHP, you can use the built-in acos() function. This function returns the arccosine of a number, in radians.

Here's an example:

main.php
<?php
$number = 0.5;
$arccosine = acos($number);
echo $arccosine; // Output: 1.0471975511966
?>
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In this example, we pass the number 0.5 to the acos() function, which returns its arccosine in radians.

Note that the input to the acos() function should be between -1 and 1. If the input is outside this range, the function will return NaN (Not a Number).