Oracle PL/SQL/Numeric Math Functions/ACOS

ACOS(1)

SQL> --ACOS(x): Returns the arccosine of x.
SQL>
SQL> select ACOS(1) from dual;
   ACOS(1)
----------
         0
SQL>

ACOS(x): Returns the arccosine of x

SQL>
SQL> --ACOS(x): Returns the arccosine of x.
SQL>
SQL> select ACOS(-1) from dual;
  ACOS(-1)
----------
3.14159265
SQL>

The ACOS() function is used to return the arccosine of the <numeric expression> passed to it.

 
Syntax: ACOS(<numeric expression>)

SQL>
SQL> SELECT   ACOS(.5) from dual;
  ACOS(.5)
----------
1.04719755