ATAN function

Description

Arc tangent function. ATAN(x) returns the arc tangent of x. The arc tangent function is the inverse function of the tangent function and calculates the angle for a given tangent x. The result is an angle expressed in radians. To convert from radians to degrees, use the DEGREES function.

The argument x can be a real number, a complex number, or a matrix. When it is a matrix, the function returns a matrix with the same dimensions and with the ATAN function applied to all elements.

Examples

ATAN(0) equals 0

ATAN(1) equals 0.78539816 (=PI/4)

Calculator

Graph

Function:	ATAN()
	X-axis	Y-axis
Minimum:	Minimum X	Minimum Y
Maximum:	Maximum X	Maximum Y

Enter the argument(s) for the function, including the symbol x.
Enter the minimum and maximum for the X-axis and for the Y-axis.
To let the software define the Y-axis automatically, leave both input fields for the Y-axis empty.

Relation with ASIN ans ACOS functions

Related functions

• TAN tangent function: returns the tangent of a number.
• Trigonometric functions

External links

• Inverse trigonometric functions on Wikipedia.