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Real-valued functions of real variable, analytic properties of functions and sequences, limits, continuity, smoothness of these.

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Behavior of $n^\alpha \sin^{\circ\, n}(n^{-\alpha}x)$

I'll write it formally: Let $\sin^{\circ\, 1}(x) = \sin(x)$ and $\sin^{\circ n+1}(x) = \sin\bigl(\sin^{\circ n}(x)\bigr)$ for $n\in \Bbb N$ with $n>1$. What is the limit as $n \to \infty$? It's fairly …