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[函数] tan的一个小结论

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TTAANN001 posted 2020-3-18 08:40 |Read mode
有人能证明吗?

有人能证明吗?

有人能证明吗?

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青青子衿 posted 2020-3-18 10:55
回复 1# TTAANN001
提问前最好是先尝试论坛的搜索功能
forum.php?mod=viewthread&tid=6988
比如关键词:三角函数、恒等式

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kuing posted 2020-3-18 15:19
回复 2# 青青子衿

我那帖因为后面有些东西还没写好,所以还没发链接给他,没想到他也会发到这里

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original poster TTAANN001 posted 2020-3-20 08:14
回复 3# kuing


   

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