Cotangent of i

Theorem

 * $\cot i = \paren {\dfrac {1 + e^2} {1 - e^2} } i$

where $\cot$ denotes the complex cotangent function and $i$ is the imaginary unit.

Also see

 * Sine of $i$
 * Cosine of $i$
 * Tangent of $i$
 * Secant of $i$
 * Cosecant of $i$