问题标题:
求y=arctan(x+1/x-1)的导数
问题描述:

求y=arctan(x+1/x-1)的导数

廖传军回答:
  y=arctan(x+1)/(x-1)   y'=1/[1+(x+1)^2/(x-1)^2]*[(x+1)/(x-1)]'   =1/[1+(x+1)^2/(x-1)^2]*[(x-1)-(x+1)]/(x-1)^2   =-2/[(x+1)^2+(x-1)^2]   =-1/(x^2+1)
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