Answer
$g(g(x))=2 x^2-x^4$
Work Step by Step
Given $f(x)=3 x-1$ and $g(x)=1-x^2$, we have
$g(g(x))=g\left(1-x^2\right)=1-\left(1-x^2\right)^2=2 x^2-x^4$
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