I see the comment by Henning Makholm may be relevant to my question on Derivative of sinc function. But I don't quite get the background. Could anybody show me to prove all the derivatives of $\mathrm{sinc}(x)$ are continuous at $x=0$ without omission of details? Thanks!
How to prove all the derivatives of $\mathrm{sinc}(x)$ is continuous at $x=0$?
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real-analysis
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2I think Jyrki Lahtonen's comment in that thread would be more useful to you. – 2012-07-06