Hinweis.

Setze $ \mbox{$f(x) := \begin{pmatrix}x\\ x^2\\ x^3\end{pmatrix}$}$ , setze $ \mbox{$g(u,y,z) := \displaystyle \int_{y}^{z} \dfrac{\sin (tu)}{t}\, \text{d}t$}$ und beobachte, daß

$ \mbox{$\displaystyle (g\circ f)(x) \; = \; \int_{x^2}^{x^3} \dfrac{\sin(tx)}{t}\, \text{d}t\; . $}$