Cotangent of Supplementary Angle

Theorem

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

where $\cot$ denotes tangent.

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

Also see

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