arc tan function
The atan function is an inverse trigonometric function. The atan function returns the arc tangent (inverse of tangent) of the input expression.
Syntax:
double atan(n)Semantics:
- n: The argument n is an expression that resolves to a number.
- return type: double.
The resultant angle is expressed in radians and is in the range -pi/2 through -pi/2 with the following exceptions:
- Returns a NULL value in the following cases:
- n resolves to a NULL value
- n does not resolve to a number
- Returns NaN if n resolves to NaN.
- Results in a zero with the same sign as n, when n is zero.
- Returns a NULL value in the following cases:
Example 12-73 arc tan function
SELECT atan(n) FROM Archery| Value of n | Output |
|---|---|
| 1 | 0.7853981633974483 |
| sqrt(3) | 1.0471975511965976 |