求函数的微分
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y=√[(1+x^2)/(1-x^2)]
lny = (1/2)[ ln(1+x^2) - ln(1-x^2) ]
dy/y = (1/2) [2x/(1+x^2) + 2x/(1-x^2) ] dx
={ 2x/[ (1+x^2).(1-x^2) ] }dx
dy = { 2x/[ (1+x^2).(1-x^2) ] } .√[(1+x^2)/(1-x^2)] dx
lny = (1/2)[ ln(1+x^2) - ln(1-x^2) ]
dy/y = (1/2) [2x/(1+x^2) + 2x/(1-x^2) ] dx
={ 2x/[ (1+x^2).(1-x^2) ] }dx
dy = { 2x/[ (1+x^2).(1-x^2) ] } .√[(1+x^2)/(1-x^2)] dx
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