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, 2016 Difficulty 1.0 Junior Prove it United Kingdom
(a) Expand and simplify ( a − b ) ( a 2 + a b + b 2 ) (a - b)(a^2 + ab + b^2) ( a − b ) ( a 2 + ab + b 2 )
(b) Find the value of 2016 3 + 2015 3 2016 2 − 2015 2 . \dfrac{2016^3 + 2015^3}{2016^2 - 2015^2}. 201 6 2 − 201 5 2 201 6 3 + 201 5 3 .
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