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x^2 - 4x= 0
x(x-4) = 0
titik potongnya adalah x= 0 dan x= 4
integral 0 sampai 4 (4x - x^2)
[2x^2 - 1/3x^3] batas 0 sampai 4
2(4)^2 - 1/3(4)^3 = 32 - 64/3 = 96/3 - 64/3 = 32/3 satuan luas