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AHSME 1952 Problem 3

    The expression a3−a−3a^3-a^{-3} equals: (A)  (a−1a)(a2+1+1a2)(B)  (1a−a)(a2−1+1a2)(C)  (a−1a)(a2−2+1a2)\textbf{(A) \ }\left(a-\frac{1}{a}\right)\left(a^2+1+\frac{1}{a^2}\right) \textbf{(B) \ }\left(\frac{1}{a}-a\right)\left(a^2-1+\frac{1}{a^2}\right) \textbf{(C) \ }\left(a-\frac{1}{a}\right)\left(a^2-2+\frac{1}{a^2}\right) (D)  (1a−a)(1a2+1+a2)(E)  none of these\textbf{(D) \ }\left(\frac{1}{a}-a\right)\left(\frac{1}{a^2}+1+a^2\right) \textbf{(E) \ }\text{none of these}

    Dataset text NuminaMath-1.5. Quoted with source.

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