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对于下列命题: ①函数y=-sin(kπ+x)(k∈Z)为奇函数; ②函数y=c...
对于下列命题:
①函数y=-sin(kπ+x)(k∈Z)为奇函数;
②函数y=cos|x|是最小正周期为π的周期函数;
③
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(
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-x)=
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;
④函数y=x|x|在x=0处连续且可导.
其中正确命题的序号为
.
考点分析:
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