The ATAN function in Excel returns the arctangent (inverse tangent) of a given number. It is a mathematical function that can be used to find the angle whose tangent is equal to the given number.

## How to use ATAN() function in Excel:

To use the ATAN function in Excel, follow these steps:

- Select the cell where you want to display the result.
- Type the following formula into the formula bar: =ATAN(number), where “number” is the value for which you want to find the arctangent.
- Press Enter to calculate the result.
- The result will be displayed in the selected cell.

### Here are examples of using the ATAN() function in Excel:

- =ATAN(1) returns 0.785398163 (radians)
- =ATAN(-1) returns -0.785398163 (radians)
- =ATAN(0) returns 0 (radians)
- =ATAN(2) returns 1.107148718 (radians)
- =ATAN(0.5) returns 0.463647609 (radians)
- =ATAN(1/2) returns 0.463647609 (radians)
- =ATAN(10/5) returns 1.107148718 (radians)
- =ATAN(PI()) returns 1.262627255 (radians)
- =ATAN(SQRT(3)) returns 1.047197551 (radians)
- =ATAN(1/SQRT(3)) returns 0.523598776 (radians)

### List of Similar Functions:

- TAN: Returns the tangent of an angle.
- ATAN2: Returns the arctangent of the specified x- and y-coordinates.
- ATANH: Returns the inverse hyperbolic tangent of a number.
- ACOT: Returns the arccotangent of a number.

### FAQs for Use of ATAN Function in Excel

**What is the domain and range of the ATAN function in Excel?**

The domain of the ATAN function is all real numbers and the range is between -pi/2 and pi/2 radians.

**Can the ATAN function return an error?**

Yes, the ATAN function can return the #NUM! error if the input value is outside the domain of the function.

**Can the ATAN function return a negative value?**

Yes, the ATAN function can return a negative value if the input value is negative.

**How do I convert the result of the ATAN function to degrees?**

To convert the result of the ATAN function from radians to degrees, use the DEGREES function.

**What is the difference between the TAN and ATAN functions?**

The TAN function returns the tangent of an angle, while the ATAN function returns the arctangent of a number.

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