Hyperbolic Secant Function is Even

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

Then $\sech$ is even:
 * $\map \sech {-x} = \sech x$

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