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sin(x) + sin(3x) = 4cos(x)
sin(x) + 3sin(x) - 4sin(x) - 4 + 4sin(x) = 0
4sin(x) - 4sin(x) - 4sin(x) + 4 = 0
sin(x) = ±1 --> x = π/2 + πk, k - целое.
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sin(x) + sin(3x) = 4cos(x)
sin(x) + 3sin(x) - 4sin(x) - 4 + 4sin(x) = 0
4sin(x) - 4sin(x) - 4sin(x) + 4 = 0
sin(x) = ±1 --> x = π/2 + πk, k - целое.