\[1)\ y = \sin{2x} - \sqrt{3}\cos{2x} =\]
\[= 2\left( \frac{1}{2}\sin{2x} - \frac{\sqrt{3}}{2}\cos{2x} \right) =\]
\[= 2\left( \cos\frac{\pi}{3} \bullet \sin{2x} - \sin\frac{\pi}{3} \bullet \cos{2x} \right) =\]
\[= 2\sin\left( 2x - \frac{\pi}{3} \right);\]
\[- 1 \leq \sin\left( 2x - \frac{\pi}{3} \right) \leq 1\]
\[- 2 \leq 2\sin\left( 2x - \frac{\pi}{3} \right) \leq 2.\]
\[Ответ:\ - 2;\ 2.\]
\[2)\ y = 2\cos{2x} + \sin^{2}x =\]
\[= 2\left( \cos^{2}x - \sin^{2}x \right) + \sin^{2}x =\]
\[= 2\cos^{2}x - 2\sin^{2}x + \sin^{2}x =\]
\[= 2\cos^{2}x - \sin^{2}x =\]
\[= 2\cos^{2}x - \left( 1 - \cos^{2}x \right) =\]
\[= 3\cos^{2}x - 1;\]
\[- 1 \leq \cos x \leq 1\]
\[0 \leq \cos^{2}x \leq 1\]
\[0 \leq 3\cos^{2}x \leq 3\]
\[- 1 \leq 3\cos^{2}x - 1 \leq 2.\]
\[Ответ:\ - 1;\ 2.\]