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y = x(x-1)(1-x^2)^(1/2)(1+x^2)^(-1/3)
lny = ln|x| + ln|x-1| + (1/2)ln|1-x^2| - (1/3)ln(1+x^2)
y'/y = 1/x + 1/(x-1) - x/(1-x^2) - 2x/[3(1+x^2)]
y' = y{1/x + 1/(x-1) - x/(1-x^2) - 2x/[3(1+x^2)]}
lny = ln|x| + ln|x-1| + (1/2)ln|1-x^2| - (1/3)ln(1+x^2)
y'/y = 1/x + 1/(x-1) - x/(1-x^2) - 2x/[3(1+x^2)]
y' = y{1/x + 1/(x-1) - x/(1-x^2) - 2x/[3(1+x^2)]}
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