Tangent Function is Odd

Theorem
For all $x \in \C$ where $\tan x$ is defined:
 * $\map \tan {-x} = -\tan x$

That is, the tangent function is odd.

Also see

 * Sine Function is Odd
 * Cosine Function is Even
 * Cotangent Function is Odd
 * Secant Function is Even
 * Cosecant Function is Odd


 * Hyperbolic Tangent Function is Odd