How to use acos in PHP
This article describe about acos() function in PHP.
The arccosine of a number as a numeric value between 0 and PI radians return by the acos() function
||Required. And must be numeric value between -1 to 1.
Note: If the range outside between -1 to 1 then browser return -1.#IND.
echo(acos(0.44) . "<br />");
echo(acos(0) . "<br />");
echo(acos(-1) . "<br />");
echo(acos(1) . "<br />");
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