SQL/MySQL/Math/SIN

Do math sin

  
/*  SELECT SIN(PI()/4) */
 SELECT SIN(PI()/4);
/*
mysql>  SELECT SIN(PI()/4);
+------------------+
| SIN(PI()/4)      |
+------------------+
| 0.70710678118655 |
+------------------+
1 row in set (0.00 sec)

*/

Use SIN

/*
mysql> select SIN( 0.3);
+------------------+
| SIN( 0.3)        |
+------------------+
| 0.29552020666134 |
+------------------+
1 row in set (0.00 sec)

*/  
select SIN( 0.3);