Cotangent of Conjugate Angle

Theorem

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

where $\cot$ denotes cotangent.

That is, the cotangent of an angle is the negative of its conjugate.

Also see

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