Factorise 8acube-bcube-12asquareb+6absquare
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8a^3 - b ^3 - 12 a ^2 b + 6 a b ^2
= (2a)^3 - (b) ^3 - 3*2a*b ( 2a - b)
using formula,
= (2a - b )^3
= (2a)^3 - (b) ^3 - 3*2a*b ( 2a - b)
using formula,
= (2a - b )^3
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