if x-1/x=5 then x^3-1/x^3=
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x-1/x=5
(x-1/x)³=5³
x³-1/x³-3(x-1/x) =125
x³-1/x³-15=125
x³-1/x³=140
(x-1/x)³=5³
x³-1/x³-3(x-1/x) =125
x³-1/x³-15=125
x³-1/x³=140
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