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【单选题】
下列说法中,正确说法的序号是 ( ) 1已知3tanx=- 3,x∈ (0, )∪( ,π),则 x= ; 2cosx= 是 x= 的充分条件; 3已知sinα= ,cosα= ,且 α∈(0,2π),则 α= .A.
①②
B.
②③
C.
①③
D.
②
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