cos(t-п) sin(-t+4п) tg(t-п) =-cost*(-sint)*tgt=cost*sint*sint/cost=sin^2t
ctg (t+п)=3 ctgt=3 1+ctg^2t=1/sin^2t 1+9=1/sin^2t sin^2t=1/10
jndtn 1/10
