COS(): cosine of the num parameter

echo COS(PI()); // Output is -1
echo "<br>";
echo COS(PI()/2); // Output  6.1232339957368E-17 // Same as 0 
echo "<br>";
echo COS(PI()/3); // Output is 0.5
echo "<br>";
echo COS(PI()/4); // Output is 0.70710678118655 
X is the angular value in radian. We get output as cosine of the input angle.

deg2rad() with COS()

We can use deg2rad() to convert Degree value to radian and then use COS().
echo cos(deg2rad(0)); // Output  is 1
echo "<br>";
echo cos(deg2rad(180)); // Output  is -1

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

Math Functions SIN() function rad2deg() function
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