Phương trình $\sin x=\sin\alpha$ có nghiệm là
![]() | $\left[\begin{array}{l}x=\alpha+k\pi\\ x=\pi-\alpha+k\pi\end{array}\right.$ |
![]() | $\left[\begin{array}{l}x=\alpha+k2\pi\\ x=-\alpha+k2\pi\end{array}\right.$ |
![]() | $\left[\begin{array}{l}x=\alpha+k\pi\\ x=-\alpha+k\pi\end{array}\right.$ |
![]() | $\left[\begin{array}{l}x=\alpha+k2\pi\\ x=\pi-\alpha+k2\pi\end{array}\right.$ |