Polynomial Root Summation 2
Let $ a, $ $ b, $ $ c, $ $ d, $ and $ e $ be the distinct roots of the equation $ x^5 + 7x^4 - 2 = 0 $. Find \begin{align*} &\frac{a^3}{(a - b)(a - c)(a - d)(a - e)} + \frac{b^3}{(b - a)(b - c)(b - d)(b - e)} \\ &\quad + \frac{c^3}{(c - a)(c - b)(c - d)(c - e)} + \frac{d^3}{(d - a)(d - b)(d - c)(d - e)} \\ &\quad + \frac{e^3}{(e - a)(e - b)(e - c)(e - d)}.\end{align*}
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