\(ĐKXĐ:2x-\dfrac{\pi}{3}\ne\dfrac{\pi}{2}+k\pi\left(k\in Z\right)\)
\(\Leftrightarrow2x\ne\dfrac{5\pi}{6}+k\pi\left(k\in Z\right)\)
\(\Leftrightarrow x\ne\dfrac{5\pi}{12}+\dfrac{k\pi}{2}\left(k\in Z\right)\)
TXĐ:\(D=R\ \)\\(\left\{\dfrac{5\pi}{12}+\dfrac{k\pi}{2}\text{|}k\in Z\right\}\)