N-order derivative of y = ln (x-1 / x + 2)
y=ln(x-1)-ln(x+2)
y'=1/(x-1)-1/(x+2)
y''=-(x-1)^(-2)+(x+2)^(-2)
...
y^(n)=(-1)^(n+1)*(n-1)!*(x-1)^(-n)+(-1)^n*(n-1)!*(x+2)^(-n)
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