Cosecant in terms of Hyperbolic Cosecant

Theorem

 * $\operatorname{csch} \left({ix}\right) = -i \csc x $

where $\csc$ is the cosecant function, $\operatorname{csch}$ is the hyperbolic cosecant, and $i^2=-1$.

Also see

 * Sine in terms of Hyperbolic Sine
 * Cosine in terms of Hyperbolic Cosine
 * Tangent in terms of Hyperbolic Tangent
 * Cotangent in terms of Hyperbolic Cotangent
 * Secant in terms of Hyperbolic Secant