1-4(1-2sin^2x)+2sinx=0
-3+8sin^2x+2sinx=0
sinx=t
8t^2+2t-3=0
t=1/8*(-1+-sqrt(1+24))=1/8*(-1+-5)
t1=1/2 t2=-3/4
sinx=-3/4
x=П*(2n+1)+arcsin(-3/4)
1-4(1-2sin^2x)+2sinx=0
-3+8sin^2x+2sinx=0
sinx=t
8t^2+2t-3=0
t=1/8*(-1+-sqrt(1+24))=1/8*(-1+-5)
t1=1/2 t2=-3/4
sinx=-3/4
x=П*(2n+1)+arcsin(-3/4)