The ATAN function in Excel is a mathematical function that returns the arctangent of a number in radians. It is a useful function when dealing with angles or when calculating slopes, among other things.

One relevant function that can be compared to the ATAN function is the ATAN2 function, which also returns the arctangent of a number but takes two arguments instead of one. The first argument is the y-coordinate, and the second argument is the x-coordinate. This function is particularly useful when dealing with coordinates in a Cartesian plane.

Another relevant function that can be compared to the ATAN function is the TAN function, which returns the tangent of a number. While the ATAN function returns the angle whose tangent is a given number, the TAN function returns the tangent of a given angle. These two functions can be used together to calculate the angle of a right triangle given the lengths of its sides.

Overall, the ATAN function is a useful tool for dealing with angles and slopes, while the ATAN2 function is better suited for dealing with coordinates in a Cartesian plane, and the TAN function can be used in conjunction with the ATAN function to solve trigonometric problems involving right triangles.

### Examples of how the ATAN function, ATAN2 function, and TAN function can be used:

**Example 1**:

Using the ATAN Function Suppose you want to find the angle (in degrees) whose tangent is 0.5. You can use the ATAN function to do this as follows:

`=DEGREES(ATAN(0.5))`

The ATAN function returns the angle in radians, so we use the DEGREES function to convert it to degrees. The result is approximately 26.565 degrees.

**Example 2: **

Using the ATAN2 Function Suppose you have a point with coordinates (2, 3) in a Cartesian plane, and you want to find the angle (in degrees) between the line connecting that point to the origin and the x-axis. You can use the ATAN2 function to do this as follows:

`=DEGREES(ATAN2(3, 2))`

The first argument (3) is the y-coordinate, and the second argument (2) is the x-coordinate. The result is approximately 56.31 degrees.

**Example 3: **

Using the TAN Function with the ATAN Function Suppose you have a right triangle with the adjacent side equal to 3 and the opposite side equal to 4. You want to find the angle (in degrees) between the hypotenuse and the adjacent side. You can use the TAN and ATAN functions to do this as follows:

`=DEGREES(ATAN(TAN(RADIANS(atan(4/3)))))`

The first step is to use the ATAN function to find the angle whose tangent is 4/3 (approximately 53.13 degrees). The next step is to convert this angle to radians using the RADIANS function. Then, we use the TAN function to find the tangent of this angle, which is equal to 4/3. Finally, we use the ATAN function again to find the angle whose tangent is 4/3, and convert it to degrees using the DEGREES function. The result is approximately 53.13 degrees.

Overall, the ATAN, ATAN2, and TAN functions are powerful tools for solving various mathematical problems involving angles, slopes, and coordinates in a Cartesian plane.

### FAQs regarding the comparison of the ATAN, ATAN2, and TAN functions in Excel

**What is the difference between the ATAN and ATAN2 functions?**

The ATAN function returns the angle whose tangent is a given number, while the ATAN2 function returns the angle whose tangent is the quotient of two specified numbers (i.e., y-coordinate and x-coordinate). The ATAN2 function is useful for finding angles in a Cartesian plane.

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

The TAN function returns the tangent of a given angle, while the ATAN function returns the angle whose tangent is a given number. The TAN function is useful for finding slopes or ratios of sides in a right triangle, while the ATAN function is useful for finding angles in various contexts.

**Can the ATAN and ATAN2 functions be used together?**

Yes, you can use the ATAN2 function to find the angle (in radians) between two points in a Cartesian plane, and then use the ATAN function to convert it to degrees or other units. For example, you can use the following formula to find the angle (in degrees) between two points with coordinates (x1, y1) and (x2, y2):`=DEGREES(ATAN2(y2-y1, x2-x1))`

### Learn more MS Excel Function to advance your skills

- Real-World uses of Excel’s ATAN Function
- Comparing the Use of ATAN, ATAN2, and TAN Functions in Excel
- Mastering the ATAN Function in Excel: Tips and Tricks
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