∫ex(x2+5x+7(x+3)2) dx = ex f(x) + c then f(x) =
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∫ex(x+2x+3+1(x+3)2)dx = ex.(x+2x+3) + C
If f(x)+2f(1−x)=x2+1 ∀ xϵR then f(x) is