if x+1/x = 2 than find x^3 + 1/x^3
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x + 1/x = 2
→ ( x + 1/x)3 = 23
→ x3 + 1/x3 +3(x + 1/x) = 8
→ x3 + 1/x3 + 3 x 2 = 8
→ x3 + 1/x3 = 2.