u = 4-x
du = -1 dx
dx = du/-1
integral (4-x)³ dx =
integral u³.du/-1 =
1/4 u^4 .du/-1 =
-1/4 u^4 du =
-1/4.(4-x)^4 + C
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u = 4-x
du = -1 dx
dx = du/-1
integral (4-x)³ dx =
integral u³.du/-1 =
1/4 u^4 .du/-1 =
-1/4 u^4 du =
-1/4.(4-x)^4 + C