Desmos可以求函数的导数，包括求一些级数。 还有其他很多功能，大家可以自己下载试试！ 最好的地方在于desmos是免费的，所有这些功能都可以直接使用，十分方便！ 2.wolfram alpha. 我用desmos发现还是有误差 (x趋于零正)，也有可能是我算错了，望指导 [图片] 显示全部 关注者 7 被浏览
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