a - 1/a =3 , a3+ 1/a3
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a-1/a=3
(a-1/a)^3=3^3
a^3-3a+3/a+1/a^3=27
a^3-3(a-1/a)+1/a^3=27
a^3-3*3+1/a^3=27
a^3+1/a^3=27+9
a^2+1/a^3=36
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