$(px + q)^{3}$ –$ (px - q)^{3}$=
2px($p^{2}x^{2}+3q^{2}$)
2q($p^{2}x^{2}+q^{2}$)
2px(px+q)
2$p^{2}x^{2}(px+q^{2}$)
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