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Gaokao Math Practice Question

设 $x \in \mathbf{R}$, 则“ $\sin x=1$ ”是“ $\cos x=0$ ”的 ($\qquad$)

  1. A.充分不必要条件
  2. B.必要不充分条件
  3. C.充分必要条件
  4. D.既不充 分也不必要条件

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