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There is no any example for acos() function. Please put this one below the acos() function's description.
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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/>";
?>
acos
(PHP 4, PHP 5, PHP 7, PHP 8)
acos — Arc cosine
Description
Returns the arc cosine of num in radians.
acos() is the inverse function of
cos(), which means that
$num == cos(acos($num)) for every value of
num that is in
the domain of acos().
Parameters
-
num -
The argument to process
Return Values
The arc cosine of num in radians.
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User Contributed Notes 1 note
rahmatjon at gmail dot com ¶
3 years ago
