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三角函数的定义域怎样判断是否关于原点对称？
三角函数的定义域怎样判断是否关于原点对称？
2025-03-15 22:37:26
推荐回答（1个）
回答1：
定义域D(不为｛0｝)，只需要满足对于任意a∈D，存在-a∈D，说明D关于原点对称
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