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= ₀³∫ 4x(x²-4x+4) dx
= ₀³∫ 4x³-16x²+16x dx
= x⁴ - (16/3).x³ + 8x² |₀³
= (3⁴ - (16/3).3³ + 8.3²) - (0)
= 81 - 144 + 72
= 9