By using the suitable identities, solve (1001)^3 – (999)^3.
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ans:a^3 - b^3 =( a - b ) ( a^2 + ab + b^2 )
By using this identity,
(1001)^3 - (999)^3
= (1001-999) (1001^2 + 1001x999 + 999^2)
=(2) (1002001+999999+ 998001)
=6000002
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