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给出下列命题: ①存在实数x,使; ②若α、β是第一象限角,且α>β,则cosα...
给出下列命题:
①存在实数x,使
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;
②若α、β是第一象限角,且α>β,则cosα<cosβ;
③函数
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是偶函数;
④A、B、C为锐角△ABC的三个内角,则sinA>cosB
其中正确命题的序号是
.(把正确命题的序号都填上)
考点分析:
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