题目内容：
下列函数中属于偶函数的是
A．y=tanx B．
C．
D．
参考答案：
答案解析：
单选题：下列函数中属于偶函数的是
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- 题目类型：单选题
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B．
C．
D．
B．
C．
D．
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第52题应填入_____
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