6/8(1/8-4)2=(6/64-3)2=3/16-6=-5.13/15
X^3 - 9x^2 + 4x + 4 = x^3 - x^2 - 8x^2 + 8x - 4x + 4 = (x - 1)(x^2 - 8x - 4)
x^3 - 7x^2 + 2x + 4 = x^3 - x^2 - 6x^2 + 6x - 4x + 4 = (x - 1)(x^2 - 6x - 4)
Получаем
(x^2 - 8x - 4) / (x^2 - 6x - 4)
Поделим обе части на 2 и учтем √2/2=sin π/4=cosπ/4
sin(a-b)=sina*cosb-sinb*cosa
sin(x-π/4)=sinxcosπ/4-sinπ/4*cosx.
sin(x-π/4)=√3/2
x-π/4=(-1)ⁿ*π/3+πn x=(-1)ⁿ*π/3+π/4+πn n∈Z