[(1-2sin² x/2) = 0
[log2(4-x²) = 0(log2(1))
[(1-✓2sin x/2)(1+✓2sinx/2) = 0
[4-x² = 1
[1-✓2sin x/2 = 0
[1+✓2sin x/2 = 0
[x² = 3
Уравнение имеет 4 корня
(c+1)(c^2+3c+2)=с^3+3c^2+2c+c^2+3c+2=c^3+4c^2+5c+2