# ACOT

## Purpose:

Calculates the inverse cotangent of any expression.

## Syntax:

ACOT(val)

 val - A scalar, series or table.

## Returns:

A scalar, series, or table.

## Example:

acot(-3*pi..pi/100..3*pi);gridhv;griddot

displays in inverse cotangent function form -3π to 3π.

## Example:

acot(1)

returns 0.78539816, or π/4.

## Example:

acot(-2..0.1..2)

returns a 41 point real series.

## Remarks:

The inverse cotangent is defined as:

for all complex z. The function is multi-valued and this definition places the branch cut in the complex plane at [-i, i].

The function calculates in radians unless degrees are specified with the SETDEGREE function.

ACOTH

ATAN

COT

COTH

GACOT

SETDEGREE