36sin^2 3x + 60sin3x + 9 = 0 3(12sin^2 3x + 20sin3x + 3) = 0 3(6sin3x+1)(2sin3x+3) = 0 sin3x = -1/6 3x = -9.6° + 360k° x = -3.2°+120k°
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