помогите с тригонометрией
sin2x+sinx+cosx+1=0
(sinx+cosx)^2+(sinx+cosx)=0 (sinx+cosx)(sinx+cosx+1)=0 sinx=-cosx tgx=-1 x=-П/4+Пk sinx+cosx=-1 √2/2sinx+√2/2cosx=-√2/2 cos(x-П/4)=-√2/2 x-п/4=П-П/4+2Пk x=П+2Пk=П(2k+1) x=3П/2+2Пk=П/2(3+4k)