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Plot the space curve and its curvature function $\kappa(t)$.

Comment on how the curvature reflects the shape of the

curve.

$$\mathbf{r}(t)=\left\langle t e^{t}, e^{-t}, \sqrt{2} t\right\rangle, \quad-5 \leqslant t \leqslant 5$$

$$

\kappa(t)=\frac{\left|\mathbf{r}^{\prime}(t) \times \mathbf{r}^{\prime \prime}(t)\right|}{\left|\mathbf{r}^{\prime}(t)\right|^{3}}

$$

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