Using identity 1003)whole cube
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1003=1000+3
(1003)³=(1000+3)³
( a+b)³= a³+3a²b+3ab²+b³
=1000³+3*1000²*3+3*1000*3²+3³
=1000000000+9000000+27000+27
=1009027027
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