Tuesday, 31 May 2016

analysis - Proving an inequality without an integral: $frac {1}{x+1}leq ln (1+x)- ln (x) leq frac {1}{x}$

I would like to prove the following inequality without integration; could you help?



$$\frac {1}{x+1}\leq \ln (1+x)- \ln (x) \leq \frac {1}{x}, \quad x > 0. $$



I can however differentiate this.



Thanks in advance.

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