котангенс • (kotangens) hn
cot θ = cos θ sin θ = tan ( π 2 − θ ) = 1 tan θ {\displaystyle \cot \theta ={\frac {\cos \theta }{\sin \theta }}=\tan \left({\frac {\pi }{2}}-\theta \right)={\frac {1}{\tan \theta }}}
