Bonjour,
[(x+1)*x]*(1+x) = (x²+x)*(1+x) = x²+x³+x+x² = x³+2x²+x
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Bonjour,
[(x+1)*x]*(1+x) = (x²+x)*(1+x) = x²+x³+x+x² = x³+2x²+x