if x=1/7+4root3 y=1/7-4root3 fid x3 +y3
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=(1/7+4root3)3+(1/7-4root3)3
=3/7+12root3+3/7-12root3
=3/7+3/7
=6/7
~0.85714285714
=3/7+12root3+3/7-12root3
=3/7+3/7
=6/7
~0.85714285714
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