X is the angular value in radian. We get output as Sin of the input angle.
echo SIN(PI()); // Output is 1.2246467991474E-16  // same as 0 
echo "<br>";
echo SIN(PI()/2); // Output  1 
echo "<br>";
echo SIN(PI()/3); // Output is 0.86602540378444
echo "<br>";
echo SIN(PI()/4); // Output is 0.70710678118655 

deg2rad() with SIN()

We can use deg2rad() to convert Degree value to radian and then use SIN().
echo SIN(deg2rad(0)); // Output  is 0
echo "<br>";
echo SIN(deg2rad(90)); // Output is 1
echo "<br>";
echo SIN(deg2rad(180)); // Output  is 1.2246467991474E-16 // same as 0 

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

Math Functions SIN() function rad2deg() function
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