Bài 1:
ĐKXĐ: \(\sqrt{3}\sin 2x-\cos 2x\neq 0\)
\(\Leftrightarrow \frac{\sqrt{3}}{2}\sin 2x-\frac{1}{2}\cos 2x\neq 0\)
\(\Leftrightarrow \cos \frac{\pi}{6}\sin 2x-\sin \frac{\pi}{6}\cos 2x\neq 0\)
\(\Leftrightarrow \sin (2x-\frac{\pi}{6})\neq 0\)
\(\Leftrightarrow 2x-\frac{\pi}{6}\neq k\pi (k\in\mathbb{Z})\)
\(\Rightarrow x\neq \frac{k\pi}{2}+\frac{\pi}{12}\)
Vậy TXĐ là: \(x\in \mathbb{R}\setminus \left\{\frac{k\pi}{2}+\frac{\pi}{12}\right\}\)