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sin (3x-π/6) = 0,5
π = 180 derajat
untuk sin positip dimulai dari kuadran I
sin 3x -π/6 = sin 30
3x - π/6 = π/6
3x = 2π/6
x = 2π/18
dilanjukan ke funsi sebelumnya k =0, k=1 dst
Kuadran 2
sin 3x -π/6 = sin 150
3x - π/6 = 5π/6
3x = π
x= π/3
dilanjutkan ke k = 0 k = 1 dst