factorise 3y^3 -y^2 -3y+1. please answer fast
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= 3y^3 -3y -y^2 + 1
= 3y(y^2 -1) -1(y^2-1)
= (3y -1)(y^2 -1)
= 3y(y^2 -1) -1(y^2-1)
= (3y -1)(y^2 -1)
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