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Find the value of the expression in fractions[Slovenia 2010]

Source:

November 14, 2010
algebra proposedalgebra

Problem Statement

Let a,ba,b be real numbers such that ab|a| \neq |b| and a+bab+aba+b=6.\frac{a+b}{a-b}+\frac{a-b}{a+b}=6. Find the value of the expression a3+b3a3b3+a3b3a3+b3.\frac{a^3+b^3}{a^3-b^3}+\frac{a^3-b^3}{a^3+b^3}.