factorise 3x^3 - x^2 - 3x + 1
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3x³-3x-x²+1,
3x(x²-1)-1(x²-1),
(x²-1)(3x-1),
(x+1)(x-1)(3x-1)
3x(x²-1)-1(x²-1),
(x²-1)(3x-1),
(x+1)(x-1)(3x-1)
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