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Misalkan :
u = x^2 - x + 3
du = 2x - 1 dx
= ʃ (2x - 1)*(u^3)*du/(2x - 1)
= ʃ u^3 du
= (1/4)u^4 + C
= (1/4)(x^2 - x + 3)^4 + C