Answer:
Given, \[2\,\,cos\,\,3\theta =\sqrt{3}\] \[\Rightarrow \cos \,\,3\theta =\frac{\sqrt{3}}{2}\] \[\Rightarrow \cos \,\,3\theta =\cos \,\,30{}^\circ \] \[3\theta =\,30{}^\circ \] \[\Rightarrow \theta =10{}^\circ \]
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