Find the coefficient of $\displaystyle \frac{1}{x^3}$ in the expansion of $\displaystyle (x-1)^3 (\frac{1}{x}+x)^6$.

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- Apr 10th 2010, 06:27 AMshawlibinomial expansion
Find the coefficient of $\displaystyle \frac{1}{x^3}$ in the expansion of $\displaystyle (x-1)^3 (\frac{1}{x}+x)^6$.

- Apr 10th 2010, 06:53 AMsa-ri-ga-ma