Understand the language of vectors in three dimensions.Extend the work of 11.2 to 11.6 to include vectors in three dimensions.Notation:Unit vectors i\bold{i}i, j\bold{j}j, k\bold{k}k, r^\bold{\hat{r}}r^a=(a1a2a3)\bold{a} = \begin{pmatrix} a_1 \\ a_2 \\ a_3 \end{pmatrix}a=a1a2a3
