Given the input 1, the function returns 0.785398163radiansas the output.
For example, the angle /4 is mapped to /4 with no branch cut.
Where the angle -/2 is mapped to positive /2 with a branch cut.
Below is the output of the cotangent function with the branch cut highlighted.
Other implementations of the function may have different branch cuts.
Below is the plot of the output of the ACOT function in Excel.
The function is the inverse of TAN.
