\[Построить\ график\ функции:\]
\[1)\ f(x) = \left\{ \begin{matrix} \cos x;\ 0 \leq x \leq 2\pi \\ x^{2};\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{\ \ }x < 0 \\ \end{matrix} \right.\ \]
\[\textbf{а)}\ D(x) = ( - \infty;\ 2\pi\rbrack;\]
\[\textbf{б)}\ E(y) = \lbrack - 1;\ + \infty);\]
\[\textbf{в)}\ \lbrack\pi;\ 2\pi\rbrack.\]
\[2)\ f(x) = \left\{ \begin{matrix} \cos x;\ \ - 3\pi \leq x < - \frac{\pi}{2} \\ \frac{2x}{\pi} + 1;\ \ \ \ \ \ \ \ \ \ \ \ \ \ x \geq - \frac{\pi}{2} \\ \end{matrix} \right.\ \]
\[\textbf{а)}\ D(x) = \lbrack - 3\pi;\ + \infty);\]
\[\textbf{б)}\ E(y) = \lbrack - 1;\ + \infty);\]
\[\textbf{в)}\ \lbrack - 3\pi;\ - 2\pi\rbrack \cup \lbrack - \pi;\ + \infty).\]