11) 27a^3 -(1/64b^3)-(27a^2/4b)+(9a/16/b^2).............1
we know identity
a^3-b^3 -3a^2b+3ab^2 = (a-b)^3
eqn 1 is written as
(3a)^3 - (1/4b)^3 -3x(3a)^2x1/4b + 3x3ax(1/4b)^2
(3a - 1/4b)^3
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11) 27a^3 -(1/64b^3)-(27a^2/4b)+(9a/16/b^2).............1
we know identity
a^3-b^3 -3a^2b+3ab^2 = (a-b)^3
eqn 1 is written as
(3a)^3 - (1/4b)^3 -3x(3a)^2x1/4b + 3x3ax(1/4b)^2
(3a - 1/4b)^3