Question

If a=
$\frac{ \sqrt{5 + 1} }{ \sqrt{5 - 1} }$
and b=
$\frac{ \sqrt{5 - 1} }{ \sqrt{5 + 1} }$
let us calculate the following
$\frac{(a - b) {}^{3} }{(a + b) {}^{3} }$
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Answer 1

Nice question but I don't know the answer