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sin 2x = sin 210
2x = 210 + k.360
x = 105 + k.180
untuk k = 0 =====> x = 105
untuk k = 1 =====> x = 285
atau
2x = (180 - 210) + k.360
2x = -30 + k.360
x = -15 + k.180
untuk k = 0 ===> x = -15 (tdk memenuhi)
untuk k = 1 ===> x = 165
HP = {105, 165, 285}