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sin (2x - 15) = 1/2 √2
sin (2x - 15) = sin 45
2x - 15 = 45 + k.360 ......(1)
2x - 45 = (180 - 45) + k.360
2x - 45 = 135 + k.360 ...........(2)
Persamaan (1)
2x - 15 = 45 + k.360
2x = 60 + k.360
x = 30 + k.180
k = 0 → x = 30
k = 1 → x = 30 + 180 = 210
Persamaan (2)
2x - 15 = 135 + k.360
2x = 150 + k.360
x = 75 + k.180
k = 0 → x = 75
k = 1 → x = 150 + 180 = 330
Hp = {30°, 75°, 210°, 330°}