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Gaokao Math Practice Question

11. 关于函数 $f(x)=\sin |x|+|\sin x|$ 有下述四个结论: (1) $f(x)$ 是偶函数 $\quad$ (2) $f(x)$ 在区间 $\left(\frac{\pi}{2}, \pi\right)$ 单调递增 (3) $f(x)$ 在 $[-\pi, \pi]$ 有 4 个零点 (4) $f(x)$ 的最大值为 2 其中所有正确结论的编号是

  1. A.(1)(2)(4)
  2. B.(2)(4)
  3. C.(1)(4)
  4. D.(1)(3)

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