The COT function in Excel calculates and returns the cotangent of a given radians. COT is the reciprocal of TAN.

cot(θ) = Adjacent **/** Opposite = b/a

Cot of the angle θ, is the ratio of the adjacent side – b to the opposite site a.

**Syntax of COT Function in Excel**

COT(number)

Where Argument number is angle in radians which you need to calculate the cotangent of.

**NOTE:** If your angle is in degrees, you will need to convert it into radians before supplying it to the COT Function with the help of Radians function

=RADIANS( degrees )

**Example of COT Function in Excel**

**Formula**

- In Row number 2 and 3 the radians value is passed to the COT Function
- In row number 4, Angle 60 degree is converted to radians and passed as input to the COT Function.
- In Row number 5 Radians -π/6 is passed as input to the COT Function.
- In row number 6, Angle -90 degree is converted to radians and passed as input to the COT Function.

** **