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Riešenie trigonometrickej rovnice
Vyrieš v \( \mathbb{R} \) rovnicu \( \cos 4 x=\frac{2 \sqrt{2}}{4} \).
\( K=\bigcup_{k \in \mathbb{Z}}\left\{\frac{\pi}{16}+\frac{k \pi}{3} ; \frac{7 \pi}{16}+\frac{k \pi}{3}\right\} \)
\( K=\bigcup_{k \in \mathbb{Z}}\left\{\frac{\pi}{16}+\frac{k \pi}{4} ; \frac{7 \pi}{16}+\frac{k \pi}{4}\right\} \)
\( K=\bigcup_{k \in \mathbb{Z}}\left\{\frac{\pi}{8}+\frac{k \pi}{2} ; \frac{5 \pi}{16}+\frac{k \pi}{2}\right\} \)
\( K=\bigcup_{k \in \mathbb{Z}}\left\{\frac{\pi}{16}+\frac{k \pi}{2} ; \frac{7 \pi}{16}+\frac{k \pi}{2}\right\} \)