Gaokao Math Practice Question
5. 已知 $\sin \theta+\sin \left(\theta+\frac{\pi}{3}\right)=1$, 则 $\sin \left(\theta+\frac{\pi}{6}\right)=(\quad)$
- A.$\frac{1}{2}$
- B.$\frac{\sqrt{3}}{3}$
- C.$\frac{2}{3}$
- D.$\frac{\sqrt{2}}{2}$
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