Click the 'Draw graph' button in the lower left corner of the EZ Graph app. Explanation below.

Here is the conventional notation for this cotangent function and the computer language type of notation used with EZ Graph:

f_{1}(x) = cot(x) |
f_{1}(x) = 1/tan(x) |

Since EZ Graph does not have a built in cotangent
function, we substitute the reciprocal of the tangent function (**1/tan(x)**)
for the cotangent function (** cot(x)**).