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Riešenie trigonometrickej rovnice pomocou substitúcie
Rieš v \( \mathbb{R} \) rovnici pomocou substitúcie:
\( \cos 2 x=\frac{1}{2} \)
\( K=\bigcup_{k \in \mathbb{Z}}\left\{\frac{\pi}{2}+k \pi ; \frac{\pi}{2}+k \pi\right\} \)
\( K=\bigcup_{k \in \mathbb{Z}}\left\{\frac{\pi}{6}+k \pi ; \frac{5 \pi}{6}+k \pi\right\} \)
\( K=\bigcup_{k \in \mathbb{Z}}\left\{\frac{\pi}{3}+k \pi ; \frac{2 \pi}{3}+k \pi\right\} \)
\( K=\bigcup_{k \in \mathbb{Z}}\left\{\frac{\pi}{4}+k \pi ; \frac{3 \pi}{4}+k \pi\right\} \)