∫x^6/(1-x^4)dx不定积分

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∫x^6/(1-x^4)dx不定积分

∫x^6/(1-x^4)dx不定积分
∫x^6/(1-x^4)dx不定积分

∫x^6/(1-x^4)dx不定积分
∫x^6/(1-x^4)dx
=∫[x^2-x^2(1-x^4)]/(1-x^4)dx
=∫[-x^2+x^2/(1-x^4)] dx
=-1/3*x^3+∫x^2/(1-x^4)dx
=-1/3*x^3-1/2*∫[1/(1-x^2)-1/(1+x^2)]dx
=-1/3*x^3-1/2*[∫1/(1-x^2)dx-∫1/(1+x^2)dx]
=-1/3*x^3-1/2*{1/2*∫[1/(1-x)+1/(1+x)]dx-arctanx}
=-1/3*x^3-1/4*[-ln(1-x)+ln(1+x)]+1/2*arctanx
=-1/3*x^3-1/4*ln[(1+x)/(1-x)]+1/2*arctanx+C