tìm nguyên hàm

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latdatdethuong137

[TEX]I=\int_{}^{}\frac{(x^4-x^2+1)+x^2}{(x^2+1)(x^4-x^2+1)}dx = \int_{}^{}\frac{dx}{x^2+1} + \int_{}^{}\frac{x^2dx}{x^6+1} [/TEX]
[TEX]= arctgx + \frac{1}{3}\int_{}^{}\frac{d(x^3)}{1+(x^3)^2}=arctgx+\frac{1}{3}arctg(x^3) +C[/TEX]
 
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