ACOT function in Excel is a mathematical function that calculates the arccotangent (inverse cotangent) of a given number. It returns the angle in radians whose cotangent is the specified number.

## Syntax

**ACOT(number)**

## Arguments

number | The real number for which you want to find the arccotangent. This number must not be zero. |

## How to use

To use the ACOT function in Excel, follow these steps:

1 |
=ACOT(number) |

Here’s an example:

1 |
=ACOT(2) |

This formula will return the arccotangent of 2, which is approximately 0.4636 radians.

Another example with a cell reference:

1 |
=ACOT(A1) |

In this case, if the value in cell A1 is, for example, 0.5, the formula will return the arccotangent of 0.5.

## Additional information:

If the argument (number) is zero, the ACOT function will result in a #NUM! error.

ACOT returns values in radians. To convert the result to degrees, you can use the RADIAN function or simply multiply it by 180/π.

Remember that the cotangent is the reciprocal of the tangent, and the arccotangent is the inverse of the cotangent. It helps you find the angle whose cotangent is the specified number.