| ATAN |
ATAN(n) |
Returns the
arc tangent of a value. This function reverses the TAN function
output. The result is an angle expressed in radians, which will fall
inclusively in the range -
/2 and 
/2.
Example
SQL> SELECT ATAN(.781285627), TAN(.663225116)
2 FROM dual;
ATAN(.781285627) TAN(.663225116)
---------------- ---------------
.663225116 .781285627
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