Secant of Conjugate Angle

Theorem

 * $\map \sec {2 \pi - \theta} = \sec \theta$

where $\sec$ denotes secant.

That is, the secant of an angle equals its conjugate.

Also see

 * Sine of Conjugate Angle
 * Cosine of Conjugate Angle
 * Tangent of Conjugate Angle
 * Cotangent of Conjugate Angle
 * Cosecant of Conjugate Angle