Oracle ATAN() function

Description

The ATAN() function is used to calculate the angle value (in radians) of a specified tangent. The specified number can be in an unbounded range and returns a value in the range of -pi/2 to pi/2, expressed in radians.
The function takes any numeric or nonnumeric data type (can be implicitly converted to a numeric data type) as an argument.
If the argument is BINARY_FLOAT, then the function returns BINARY_DOUBLE. Otherwise, the function returns the same numeric data type as the argument.

Syntax:

ATAN(N)

Parameters:

Pictorial Presentation of ATAN() function

Example:

The statement below will return the arc tangent value of the number specified as an argument.

SELECT ATAN(4) FROM dual;

Here is the result.

   ATAN(4)
----------
1.32581766

Example: ATAN() function using negative value

This statement below will return the arc tangent value of the number defined as an argument.

SELECT ATAN(-4) FROM dual;

Here is the result.

  ATAN(-4)
----------
-1.3258177

Example: ATAN() function using a division

This statement below will return the arc tangent value of the number (3 divided by 2) defined as arguments.

SELECT ATAN(3/2) FROM dual;

Here is the result.

 ATAN(3/2)
----------
.982793723

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