нарисуем некую табличку для степеней
i = √-1
i = i^5 = i^9 = i^13 =....= i
i^2 = i^6 = 1^10 = .... = -1
i^3 = i^7 = i^11 =....= -i
i^4 = i^8 = i^12 = .... = 1
i^8 = 1
i^40 = 1
i^30 = -1
i^2 = -1
i^52 = 1
i(8)+i(40) + i(30) +2i(2)- i(52) = 1 + 1 - 1 - 2 - 1 = -2
6х - 8ху = 2х(3-4у)
..............................
Решение
sin2x = cosx
2sinx*cosx - cosx = 0
cosx*(2sinx - 1 ) = 0
1) cosx = 0
x = π/2 + πk, k ∈ Z
2) 2sinx - 1 = 0
sinx = 1/2
x = (-1)^n* arcsin(1/2) + πn, n ∈ Z
x = (-1)^n* (π/6) + πn, n ∈ Z