How I find the sum of this series? [math]\displaystyle \sum_{k=1}^{\infty} \frac 1 k \ln(\frac 1 k + 1)[/math] How I find the sum of this series? [math]\displaystyle \sum_{k=1}^\infty \frac{1}{k}-\frac{k}{1+k^2}[/math]