2sin^2(4x) - 4sin^2(4x) - cos^2(4x) - 3sin(4x)cos(4x) + 4cos^2(4x) = 0 -2sin^2(4x) - 3sin(4x)cos(4x) = 0 sin(4x)[2sin(4x) + 3cos(4x)] = 0 sin4x = 0 2sin4x + 3cos4x = 0 |:cos4x 4x = Пk 2tg4x + 3 = 0 x = Пk/4 tg4x = -3/2 4x = arctg(-1.5) + Пk x = -arctg(1,5)/4 + Пk/4