Hyperbolic Secant Function is Even

Theorem
Let $\operatorname{sech}: \C \to \C$ be the hyperbolic secant function on the set of complex numbers.

Then $\operatorname{sech}$ is even:
 * $\operatorname{sech} \left({-x}\right) = \operatorname{sech} x$

Also see

 * Hyperbolic Sine Function is Odd
 * Hyperbolic Cosine Function is Even
 * Hyperbolic Tangent Function is Odd
 * Hyperbolic Cotangent Function is Odd
 * Hyperbolic Cosecant Function is Odd


 * Secant Function is Even