For $x \in (0, \pi)$, the equation $\sin x + 2\sin 2x - \sin 3x = 3$ has (A) infinitely many solutions (B) three solutions (C) one solution (D) no solution
For $x \in (0, \pi)$, the equation $\sin x + 2\sin 2x - \sin 3x = 3$ has\\
(A) infinitely many solutions\\
(B) three solutions\\
(C) one solution\\
(D) no solution