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y=ln(x^2+3x+2) y'=(2x+3)/(x^2+3x+2)=1/(x+1)+1/(x+2) 囙此y的的n階導數為(-1)^(n-1)*(n-1)!/(x+1)^n+(-1)^(n-1)*(n-1)!/(x+2)^n
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