<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">Zderivujte:
$$
\log (x + \sqrt{x^2 + 1}), \qquad \log (x + \sqrt{x^2 - 1}).
$$
a upravte.
</pre></body></html>