请帮忙求导,高等数学题目,谢谢
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定义域 : x > 1
lnf(x) = [e^(π/4)+arctanx]ln(x-1)
f'(x)/f(x) = ln(x-1)/(1+x^2) + [e^(π/4)+arctanx]/(x-1)
f'(x) = f(x){ln(x-1)/(1+x^2) + [e^(π/4)+arctanx]/(x-1)}
= (x-1)^ [e^(π/4)+arctanx]{ln(x-1)/(1+x^2) + [e^(π/4)+arctanx]/(x-1)}
lnf(x) = [e^(π/4)+arctanx]ln(x-1)
f'(x)/f(x) = ln(x-1)/(1+x^2) + [e^(π/4)+arctanx]/(x-1)
f'(x) = f(x){ln(x-1)/(1+x^2) + [e^(π/4)+arctanx]/(x-1)}
= (x-1)^ [e^(π/4)+arctanx]{ln(x-1)/(1+x^2) + [e^(π/4)+arctanx]/(x-1)}
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