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A . Persamaan θ
θ = ∫wdt
θ = ∫(4-0,9t²)dt
θ = 4t - 0,3t³ rad
B. persamaan percepatan sudut
α = dw / dt
α = 4 - 0,9t² / dt
α = 0-1,8t
α = -1,8t rad/s²