surface, and from that, a remix tangent plane. should be able to use them to construct remix a normal vector to the. Because we have remix two tangent vectors to the surface, we. partial derivatives of $\vec r(a,t)$ are tangent vectors to the remix.
remix ]In the previous problem, you should have noticed that the. point and a vector, we know remix (from chapter 2) how to get an. remix different direction vectors from $D\vec r$. plugging $(3,\pi)$ into $\vec r$, remix and you've got two.