<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">{Dokažte nerovnost:
   $$
      \Biggl| \sin \biggl( \sum_{k=1}^n x_k \biggr) \Biggr| \le \sum_{k=1}^n \sin x_k,
      \qquad 0\le x_k\le\pi.
   $$}</pre></body></html>