Function

*f*of {*x*∈ \(\mathbb{R}\) |*x*≠*k*π where*k*∈ \(\mathbb{Z}\)} in \(\mathbb{R}\) defined*f*(*x*) = \(\dfrac{1}{\textrm{tan}(x)}\).### Notation

The cotangent function is noted as “cot(*x*)” and is read as “cotangent of x.”

We sometimes see the notation “cotg(*x*)” to indicate “cotangent of x.