limx趋近于0 1-cosx除以x乘以cosx limx趋近于01-cosx/x=多少
limx\u8d8b\u8fd1\u4e8e01-cosx/x=\u591a\u5c11\u6781\u9650\u662f0\uff0c\u5982\u4e0b
1
如图
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