take the arcsine of a number in php

To take the arcsine of a number in PHP, you can use the asin() function which returns the arcsine in radians of a given number. Here's an example:

main.php
$number = 0.5;
$arcsine = asin($number);

echo $arcsine; // outputs 0.5235987755983
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In this example, $number is set to 0.5 and the asin() function is used to calculate the arcsine of 0.5 in radians. The result is stored in the $arcsine variable and then printed using the echo statement.

Note that the asin() function expects the input in radians, not degrees. So, if you have an angle in degrees, you need to convert it to radians first using the deg2rad() function.