SIN() function

SELECT ROUND(SIN(PI()),2); // Output is 0.00
SELECT SIN(PI()/2); // Output is 1
SELECT ROUND(SIN(PI()/3),2); // Output is 0.87 

SELECT SIN( X )

SIN() with PI()

SIN() with RADIANS

Radians function convert degree value to radian.

SELECT SIN(RADIANS(0)); // Output is 0
SELECT SIN(RADIANS(90)); // Output is 1
SELECT ROUND(SIN(RADIANS(180)),2); // Output is 0.00