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√3*sin(4x) = - cos(4x) - разделим обе части на √3*cos(4x)
tg(4x) = -1/√3 = -√3/3
4x = -π/6 + πk, k∈Z
x = -π/24 + (πk/4), k∈Z
x∈[-π/2; π/2]
Найдем, при каких k корни уравнения будут принадлежать указанному в условии отрезку:
-π/2 ≤ -π/24 + (πk/4) ≤ π/2
-π/2 + π/24 ≤ πk/4 ≤ π/2 + π/24
-11π/24 ≤ πk/4 ≤ 13π/24
-11/6 ≤ k ≤ 13/6, k∈Z
k = -1, 0, 1, 2
Итого будет 4 корня.
k = -1, x1 = -π/24 - π/4 = (-π - 6π)/24 = -7π/24
k = 0, x2 = -π/24
k = 1, x3 = -π/24 + π/4 = (-π + 6π)/24 = 5π/24
k = 2, x4 = -π/24 + 2π/4 = (-π + 12π)/24 = 11π/4

ответ: -7π/24, -π/24, 5π/24, 11π/24