3sin^3x-5sinxcosx+2cos^2x=0
Делим на cos ^2x ------------------------- 3tg^2x-14tgx-5=0 tgx=t 3t^2-14t-5=0 t=5 t=-1/3 tgx=5 x=arctg5+Pik tgx=-1/3 x=arctg(-1/3)+Pik=-arctg(1/3)+Pik --------------------------------------------