# 3.5.2.1.9 Acot

## Description

The acot(x) function returns the inverse of the corresponding trigonometric function. x can be any value. Values returned are in the first or second quadrant. Returned values are in radians, degrees or gradians, depending upon the system.math.angularunits object property (which can also be set in the Options dialog box).

## Syntax

double acot(double x)

## Parameter

x

is any real number.

## Return

Returns the arccotangent of x.

## Example

acot(-1)=; //should return 2.3561944901923
acot(-10)=; //should return 3.0419240010986