8m^3-12m^2n+6mn^2-n^3=__________ (i) (2m+n)^3 (ii) (m+2n)^3 (iii) (2m-n)^3 (iv) (m-2n)^3
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12m^2n+6mn^2-n^3=__________ (i) (2m+n)^3 (ii) (m+2n)^3 (iii) (2m-n)^3 (iv) (m-2n)^3
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