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sin³(x) = 1/8 ⇔ ruas kiri dan kanan masing² di akar pangkatkan 3
kayak gini loh:
x = 30 dan 150 :)
Sin³x = 1/8
(Sinx)³ = (1/2)³
Sinx = 1/2 untuk 0' ≤ x ≤ 360'
x = 30' , 150'
HP { 60', 150' }