ASIN
ASIN(n)

Returns the arc sine of a value between -1 and 1. This function reverses the output of the SIN function. The result is an angle expressed in radians, which will fall inclusively in the range -/2 and /2.

Example

SQL> SELECT ASIN(-1), ASIN(0), ASIN(1)
  2  FROM dual;

  ASIN(-1)    ASIN(0)    ASIN(1)
---------- ---------- ----------
-1.5707963          0 1.57079633

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