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Rumus = x = α + k.360 dan x = (180 - α) + k.360
x = 110 + k.360
untuk k = 0 -----> x = 110
x = (180 - 110) + k.360
= 70 + k.360
untuk k = 0 ------> x = 70
Jadi HP = {70 , 110}
sin x = sin 5π/6 -----> sin x = sin 150
x = 150 + k.360
untuk k = 0 -----> x = 150
x = (180 - 150) + k.360
= 30 + k.360
untuk k = 0 ------> x = 30
Jadi HP = {30 , 150}