Applicare la formula: $\frac{\frac{a}{b}}{c}$$=\frac{a}{bc}$, dove $a=xe^{2x}$, $b=1+x^2$, $c=e^{2x}$, $a/b/c=\frac{\frac{xe^{2x}}{1+x^2}}{e^{2x}}$ e $a/b=\frac{xe^{2x}}{1+x^2}$

Applicare la formula: $\frac{a}{a}$$=1$, dove $a=e^{2x}$ e $a/a=\frac{xe^{2x}}{\left(1+x^2\right)e^{2x}}$