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= ∫ (3-x)³ x dx
mis :
U = 3-x
du/dx = -1
du = -dx
U= 3-x
x = -(u-3)
∫(3-x)³x dx
∫(U)³(U-3) du
∫U^4 - 3U³ du
= 1/5 U^5 -3/4 U^4 +C