(%o8) \frac{e^{x}}{x^{2} + 1} − \frac{6 x e^{x}}{(x^{2} + 1)^{2}} − \frac{6 e^{x}}{(x^{2} + 1)^{2}} + \frac{24 x^{2} e^{x}}{(x^{2} + 1)^{3}} + \frac{24 x e^{x}}{(x^{2} + 1)^{3}} − \frac{48 x^{3} e^{x}}{(x^{2} + 1)^{4}}

1