factories a^3 - 3root3b^3
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a^3-√3*√3*√3b^3
a^3-(√3b)^3 = (a-√3b)(a^2+a*√3b+(√3b)^2)
a^3-(√3b)^3 = (a-√3b)(a^2+a*√3b+(√3b)^2)
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a^3-3√3b^3
(a)^3-(√3b)^3
(a-√3b) (a^2+√3ab+3b^2)
(a)^3-(√3b)^3
(a-√3b) (a^2+√3ab+3b^2)
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