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y = ½ A
θ → φ = __ ?
Persamaan simpangan
y = A sin θ
½ A = A sin θ
sin θ = ½
θ = 30º
Sudut fase
θ = 30º = 30º × π/180º = π/6 rad
Fase
φ = θ / 2π = (π/6) / 2π = 1/12 ← jawaban.
Ok ?