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在导数中存在着这样一类“姊妹”题,它们表面看非常相象,条件仅一、二字之差,但实质却完全不同,现列举数例如下,供大家参考．
There is such a “sister” question in the derivative. They look very similar on the surface. The condition is only the difference between the first and second words. However, the essence is completely different. The numbers are listed below for your reference.