ATAN

Returns the inverse tangent (the a rctangent) of a number. The output is a value between -pi/2 and +pi/2.

Syntax

ATAN(number)

number: The number (tan value) whose inverse tan you want to calculate. Eg., -2

Remarks

To return the angle in degrees, use the DEGREES function or multiply the given it by 180/PI().

Examples

Formula	Result
=ATAN(0.5)	0.463647609
=ATAN(-2)	-1.107148718
=ATAN(3/2)	0.982793723

Get a hands-on experience of the function in the embedded range below.

Possible Errors

Errors	Meaning
#N/A!	The function could not find the value it was asked to look for. Commonly occurs in VLOOKUP and similar functions.
#NAME!	The function name is incorrect or invalid. The given defined name (if any) is invalid. There is a typo in the defined name used in the function. Double quotes are missing for text values in the function. Colon missing in a cell range reference.
#VALUE!	The given argument's data type is incorrect or invalid. For example, the function =DATE(A1:A3) will return a #VALUE error when a text value is present in the range.
#REF!	The given cell reference is incorrect or invalid. This error may occur when a cell/range has been deleted, moved, or pasted over.

Similar Functions

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