Question
Given an interval $[a, b]$ that satisfies hypothesis of Rolle's theorem for the function $f(x)=x^4$
$+x^2-2$. It is known that $a=-1$. Find the value of $b$.
$+x^2-2$. It is known that $a=-1$. Find the value of $b$.
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$\left(\sqrt{2}, \frac{\pi}{4}\right)$