↵ Solve this: 22. The number of all possible value of $\theta$, where 0<$\theta$<$\mathrm{\pi }$, for which the system of equations. (y+z) cos 3 $\theta$=(xyz) sin 3$\theta$ and (xyz) sin 3$\theta$ = (y+2z) cos 3 $\theta$ + ysin 3$\theta$ have a solution (x0,y0,z0) with ​y0z0 $\ne$0, is ....

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