ASIN
SQL> select ASIN(1) from dual;
ASIN(1)
----------
1.57079633
SQL> select ASIN(-1) from dual;
ASIN(-1)
----------
-1.5707963
SQL>
SQL> select ASIN(1) from dual;
ASIN(1)
----------
1.57079633
SQL> select ASIN(-1) from dual;
ASIN(-1)
----------
-1.5707963
SQL>