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lny=ln(1-x)+2ln(1-x^2)+3ln(1-x^3)の両側に対数y′/y=-1/(1-x)+2/(1-x^2)*(-2x)+3/(1-x^3)*(-3x^2)=-1/(1-x)-4x/(1-x^2)-9x^2/(1-x^3)y′=-[1/(1-x)+4x^2)+9x^2/(1-x^3)]y=-[(1-x^2)(1-x^3)...
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