ctgx=−
3
x=arcctg(- \sqrt{3})+ \pi n,nx=arcctg(−
)+πn,n ∈Z
x= \frac{5 \pi }{6}+ \pi n,x=
6
5π
+πn, ∈Z
ctgx=−
3
x=arcctg(- \sqrt{3})+ \pi n,nx=arcctg(−
3
)+πn,n ∈Z
x= \frac{5 \pi }{6}+ \pi n,x=
6
5π
+πn, ∈Z