Question

1 вариант, пожалуйста, СРОЧНО!!!!!!

Answer 1

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))