The ATAN2 function in Excel

 

The ATAN2 function in Excel is a math and trigonometry function that calculates the arctangent of the specified x- and y-coordinates in a plane. The result of the function is returned in radians and is between -π and π.

The syntax for the ATAN2 function is as follows:

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=ATAN2(y,x)

where:

• y: The y-coordinate for which you want to calculate the arctangent.
• x: The x-coordinate for which you want to calculate the arctangent.

The ATAN2 function returns the arctangent of the specified x- and y-coordinates in radians. The result is between -π and π radians.

Here's an example of how to use the ATAN2 function:

Suppose you have a point with the coordinates (3, 4) in a plane. You can use the ATAN2 function to calculate the arctangent of the point as follows:

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=ATAN2(4, 3)

In this example, the ATAN2 function returns the value 0.93 radians, which is the arctangent of the point (3, 4) in radians.

Note that the ATAN2 function takes into account the signs of the input coordinates and returns the correct angle for the point in the plane. If the x-coordinate is positive and the y-coordinate is negative, the function returns an angle in the fourth quadrant. If the x-coordinate is negative and the y-coordinate is positive, the function returns an angle in the second quadrant. If both coordinates are negative, the function returns an angle in the third quadrant. Also, the result of the ATAN2 function is always in radians, so you may need to convert it to degrees using the RADIANS function or by multiplying it by 180/π to get the angle in degrees.