C
chichichi7


[TEX]A=\int_{1/2}^{2} \frac{lnx}{x^2+1}[/TEX]
[TEX]B=\int_{0}^{1} \frac{x^2}{(x^2+1)^3}[/TEX]
[TEX]C=\int_{0}^{1} \frac{x^3}{x^4+x^2+1}[/TEX]
[TEX]B=\int_{0}^{1} \frac{x^2}{(x^2+1)^3}[/TEX]
[TEX]C=\int_{0}^{1} \frac{x^3}{x^4+x^2+1}[/TEX]