3 X +x J.4—dx. 2.13. ° X +1 хелп
[m] =∫ \frac{x^3}{x^4+1}dx+ \frac{x}{(x^2)^2+1}dx=[/m] [m]=\frac{1}{4} ∫ \frac{d(x^4+1)}{x^4+1}dx+\frac{1}{2} ∫ \frac{d(x^2)}{(x^2)^2+1} = [/m] [m]=\frac{1}{4}ln(x^4+1)+\frac{1}{2}arctg x^2+C[/m] два табличных интеграла