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Riešenie rovnice s kosínusom
Vyrieš v \( \mathbb{R} \) rovnicu \( \cos x=2 \).
\( \large\begin{array}{l}\cos x=2\\ K=\{\frac{\pi}{2}\}\end{array} \)
\( \large\begin{array}{l}\cos x=2\\ K=\{\pi\}\end{array} \)
\( \large\begin{array}{l}\cos x\neq2\\ K=\emptyset\end{array} \)
\( \large\begin{array}{l}\cos x=2\\ K=\{0\}\end{array} \)