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      <title>高中数学归纳</title>
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      <description>&lt;p&gt;独立性检验(卡方检验) Xa0.0x&#xA;关联性检验(R, r) 样本相关系数&#xA;误差和残差&lt;/p&gt;&#xA;&lt;p&gt;sin确定(函数值满足要求)了不代表cos确定了,这种情况下应该用(pi-参数)横向不变sin切换cos和sin的参数&#xA;cos确定(函数值满足要求)了不代表sin确定了,这种情况下应该用(-参数或者2pi-参数)纵向不变cos切换cos和sin的参数&lt;/p&gt;</description>
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