Factorise 64a^6-729b^6
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(8a^3)^2 - (27b^3)^2
(8a^3-27b^3) (8a^3+27b^3)
from formula (x^2 - a^2 )= (x- a) (x+a)
(8a^3-27b^3) (8a^3+27b^3)
from formula (x^2 - a^2 )= (x- a) (x+a)
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