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