# Math Help - unit tangent and normal vectors

1. ## unit tangent and normal vectors

r(t)=cos(t)i + sin(t)j + (t)k. Find the unit tangent and normal vectors as well as the curvature. Sketch the graph.

r(t)=cos(t)i + sin(t)j + (t)k. Find the unit tangent and normal vectors as well as the curvature. Sketch the graph.
You should start by reviewing and then applying the mathematical formulas for these three things. Where do you get stuck?

3. I get how to use the forumals Im just not sure how to apply when its in the i + j + k form

4. Given a curve in the form $\vec{r}(t)= f(t)\vec{i}+ g(t)\vec{j}+ h(t)\vec{k}$, a tangent vector but not necessarily the unit tangent, is $\vec{r}'(t)= f'(t)\vec{i}+ g'(t)\vec{j}+ h'(t)\vec{k}$.