Gaokao Math Practice Question
5. 将函数 $f(x)=\sin \left(\omega x+\frac{\pi}{3}\right)(\omega>0)$ 的图像向左平移 $\frac{\pi}{2}$ 个单位长度后得到曲线 $C$, 若 $C$ 关于 $y$ 轴对称，则 $\omega$ 的最小值是（)
- A.$\frac{1}{6}$
- B.$\frac{1}{4}$
- C.$\frac{1}{3}$
- D.$\frac{1}{2}$
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