I seem to remember liking a proof I once saw for (sin x)', but I don't quite remember what it is. Calculus is getting further and further away.
I wish MathML were more ubiquitous so we could carry on these conversations with proper notations.
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"Please, Aslan," said Lucy, "what do you call soon?"
"I call all times soon," said Aslan; and instantly he vanished away and Lucy was alone with the Magician.
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