Let $f: R \rightarrow R$ be a function defined $f(x)=\frac{x}{\left(1+x^4\right)^{1 / 4}}$ and $g(x)=f(f(f(f(x))))$ then
$$
18 \int_0^{\sqrt{2 \sqrt{5}}} x^2 g(x) d x
$$
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