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Gaokao Math Practice Question

函数 $f(x)=\cos x-\cos 2 x$, 试判断函数的奇偶性及最大值 ($\quad$)

  1. A.奇函数, 最大值为 2
  2. B.偶函数, 最大值为 2
  3. C.奇函数, 最大值为 $\frac{9}{8}$
  4. D.偶函数,最大值为 $\frac{9}{8}$

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