Definition:Tangent Function/Complex

Definition
Let $z \in \C$ be a complex number.

The complex function $\tan z$ is defined as:


 * $\tan z = \dfrac {\sin z} {\cos z}$

where:
 * $\sin z$ is the sine of $z$
 * $\cos z$ is the cosine of $z$.

The definition is valid for all $z \in \C$ such that $\cos z \ne 0$.

Also see

 * Definition:Complex Cotangent Function