1 вариант, пожалуйста, СРОЧНО!!!!!!
2sin^2(x)-6 +6sin^2(x)-6sin(x)-7=0 8sin^2(x)-6sin(x)-13=0 t=sin(x) 2t^2-6t-13=0 t1=3/2+(1/2)*sqrt(35) t2=3/2-(1/2)*sqrt(35) sin(x)=3/2+(1/2)*sqrt(35) x=arcsin(3/2+(1/2)*sqrt(35)) sin(x)=3/2-(1/2)*sqrt(35) x=-arcsin(-3/2+(1/2)*sqrt(35))