Phương trình: $\displaystyle \left( \sin x-\sin 2x \right)\left( \sin x+\sin 2x \right)={{\sin }^{2}}3x$ có các nghiệm là
A. $\displaystyle \left[ \begin{array}{l}x=k\frac{\pi }{3}\\x=k\frac{\pi }{2}\end{array} \right.$
B. $\displaystyle \left[ \begin{array}{l}x=k\frac{\pi }{6}\\x=k\frac{\pi }{4}\end{array} \right.$
C. $\displaystyle \left[ \begin{array}{l}x=k\frac{2\pi }{3}\\x=k\pi \end{array} \right.$
D. $\displaystyle \left[ \begin{array}{l}x=k3\pi \\x=k2\pi \end{array} \right.$
A. $\displaystyle \left[ \begin{array}{l}x=k\frac{\pi }{3}\\x=k\frac{\pi }{2}\end{array} \right.$
B. $\displaystyle \left[ \begin{array}{l}x=k\frac{\pi }{6}\\x=k\frac{\pi }{4}\end{array} \right.$
C. $\displaystyle \left[ \begin{array}{l}x=k\frac{2\pi }{3}\\x=k\pi \end{array} \right.$
D. $\displaystyle \left[ \begin{array}{l}x=k3\pi \\x=k2\pi \end{array} \right.$
Loga
Hóa Học lớp 12
