postgres=# -- asin(x): Returns the inverse sine of x postgres=# SELECT asin(1), asin(0), asin(-1), asin(sin(1)) AS inverse_example; asin | asin | asin | inverse_example -----------------+------+------------------+----------------- 1.5707963267949 | 0 | -1.5707963267949 | 1 (1 row) postgres=#