Trying to solve this limit without derivatives I found this answer that is pretty straightforward and I can easily follow the flow. I can understand why u→∞ because:
lim
but how there is a relation to {x\to 0} with {u\to \infty} when we need to find the limit that approaches 0.
Answer
When u \rightarrow \infty, x = \frac 1u \rightarrow 0, as needed.
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