Question

Tìm tập xác định: \(y=\tan\left(2x-\dfrac{\pi}{5}\right)\)

Answer 1

\(ĐK:2x-\dfrac{\pi}{5}\ne\dfrac{\pi}{2}+k\pi\)

\(\Leftrightarrow2x\ne\dfrac{\pi}{2}+\dfrac{\pi}{5}+k\pi\)

\(\Leftrightarrow2x\ne\dfrac{7\pi}{10}+k\pi\)

\(\Leftrightarrow x\ne\dfrac{7\pi}{20}+k\dfrac{\pi}{2}\)

\(\Rightarrow TXĐ:D=R\)\(/\left\{\dfrac{7\pi}{20}+k\dfrac{\pi}{2};k\in Z\right\}\)