\[1)\ \left\{ \begin{matrix} y = \log_{2}x - 1 \\ y = \cos x\text{\ \ \ \ \ \ \ \ \ \ } \\ \end{matrix} \right.\ \]
\[Ответ:\ \ да.\]
\[2)\ \left\{ \begin{matrix} y = \frac{x^{2} + 2}{x^{2}} \\ y = \cos x\text{\ \ \ } \\ \end{matrix} \right.\ \]
\[y = 1 + \frac{2}{x^{2}}.\]
\[Ответ:\ \ нет.\]