Gaokao Math Practice Question
若动直线 $x=a$ 与函数 $f(x)=\sin x$ 和 $g(x)=\cos x$ 的图象分别交于 $M$, $N$ 两点，则 $|M N|$ 的最大值为($\qquad$)
- A.1
- B.$\sqrt{2}$
- C.$\sqrt{3}$
- D.2
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