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\frac{\left(1+2x+x^{2}\right)\left(1-x+x^{2}\right)}{\left(1+x^{3}\right)\left(1+x\right)}
Divide \frac{1+2x+x^{2}}{1+x^{3}} by \frac{1+x}{1-x+x^{2}} by multiplying \frac{1+2x+x^{2}}{1+x^{3}} by the reciprocal of \frac{1+x}{1-x+x^{2}}.
\frac{\left(x+1\right)^{2}\left(x^{2}-x+1\right)}{\left(x+1\right)^{2}\left(x^{2}-x+1\right)}
Factor the expressions that are not already factored.
1
Cancel out \left(x+1\right)^{2}\left(x^{2}-x+1\right) in both numerator and denominator.