$\frac{2x e^{\arctan(x^2)}}{1 + x^4}$

$\frac{e^{\arctan(x^2)}}{1 + x^2}$

$\frac{2x}{1+x^4} e^{\arctan(x^2)}$

$\frac{2x}{1+x^2} e^{\arctan(x^2)}$