if x+1/x =3 then find x^3+1/x^3
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cubing on both sides
x^3+1/x^3+3(x+1/x)=27
x^3+1/x^3+3(3)=27
x^3+1/x^3=18
x^3+1/x^3+3(x+1/x)=27
x^3+1/x^3+3(3)=27
x^3+1/x^3=18
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