$\left[ {\begin{array}{}{x = \frac{\pi }{3} + k2\pi }\\{x = \frac{{2\pi }}{3} + k2\pi }\end{array}} \right.\quad \left( {k \in \mathbb{R}} \right)$
$\left[ \begin{array}{} x=\frac{\pi }{6}+k2\pi \\ x=\frac{5\pi }{6}+k2\pi \\\end{array} \right.\quad \left( k\in \mathbb{R} \right)$.$\left[ \begin{array}{} x=\frac{\pi }{6}+k2\pi \\ x=\frac{5\pi }{6}+k2\pi \\\end{array} \right.\quad \left( k\in \mathbb{Z} \right)$.$\left[ \begin{array}{} x=\frac{\pi }{6}+k2\pi \\ x=\frac{-\pi }{6}+k2\pi \\\end{array} \right.\quad \left( k\in \mathbb{Z} \right)$.
Gửi 5 năm trước