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4.函数 $f(x)=\sin \frac{x}{3}+\cos \frac{x}{3}$ 的最小正周期和最大值分别是 $(\quad)$

Gaokao · Math · previous-year question

  1. A.$3 \pi$ 和 $\sqrt{2}$
  2. B.$3 \pi$ 和 2
  3. C.$6 \pi$ 和 $\sqrt{2}$
  4. D.$6 \pi$ 和 2

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