acos():

acos(X);
X is the angular value in radian. We get output as acos of the input angle.

It takes input range from +1 to -1 , for any other input it returns NAN ( not a number )
<?Php
echo acos(0); // Output is 1.5707963267949
echo "<br>";
echo acos(1); // Output  0
echo "<br>";
echo acos(-1); // Output is 3.1415926535898
echo "<br>";
echo acos(-5); // Output is NAN 
?>

deg2rad() with acos()

We can use deg2rad() to convert Degree value to radian and then use acos().
<?Php
echo acos(deg2rad(0)); // 1.5707963267949
echo "<br>";
echo acos(deg2rad(90)); // NAN
echo "<br>";
echo acos(deg2rad(180)); // NAN 
?>

Plotting of SIN & SIN curves by using PHP GD function with deg2rad()

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