Tangent of i

Theorem

 * $\displaystyle \tan i = \left({ \frac {e^2 - 1} {e^2 + 1} }\right) i$

where $\tan$ denotes the complex tangent function and $i$ is the imaginary unit.

Also see

 * Sine of i
 * Cosine of i
 * Cotangent of i
 * Secant of i
 * Cosecant of i