Evaluate limn→∞∑k=1nnn2+k2\lim_{n \to \infty} \sum_{k=1}^{n} \frac{n}{n^2+k^2}limn→∞∑k=1nn2+k2n.
π/4\pi/4π/4
ln2\ln 2ln2
111
π/2\pi/2π/2