PostgreSQL/Math Functions/sin

sin(x): Returns the sine of x

postgres=#
postgres=# -- sin(x): Returns the sine of x
postgres=# SELECT sin(pi() / 4) AS quarter_pi,
postgres-#        sin(pi() / 2) AS half_pi;
    quarter_pi     | half_pi
-------------------+---------
 0.707106781186547 |       1
(1 row)
postgres=#