Secant of i

Theorem

 * $\displaystyle \sec i = \frac {2e} {e^2 + 1}$

where $\sec$ denotes the complex secant function and $i$ is the imaginary unit.

Also see

 * Sine of i
 * Cosine of i
 * Tangent of i
 * Cotangent of i
 * Cosecant of i