series expansion at x=0 \frac{x^4}{1-x^4}*\frac{x^3}{1-x^3}*\frac{x^2}{1-x^2}*\frac{x}{1-x}series expansion at x=0 \frac{x^4}{1-x^4}*\frac{x^3}{1-x^3}*\frac{x^2}{1-x^2}*\frac{x}{1-x}

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