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:
limu→∞(1+1u)u=e
but how there is a relation to x→0 with u→∞ when we need to find the limit that approaches 0.
Answer
When u→∞, x=1u→0, as needed.
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