ACOS function

Description

Arccosine function. ACOS(x) returns the arccosine of x. The arccosine function is the inverse function of the cosine function and calculates the angle for a given cosine. X must be in the [-1..1] range. 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 ACOS function applied to all elements.

Examples

ACOS(0) equals 1.5707963 (=PI/2)

ACOS(1) equals 0

Calculator

Graph

Function:	ACOS()
	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 and ATAN functions

Related functions

• COS function: returns the cosine of a number.
• Trigonometric functions

External links

• Inverse trigonometric functions on Wikipedia.