Let such that
In terms of the unit coordinate vectors compute the cross product
Using part (a) of the previous exercise and equation (13.10) on page 490 of Apostol () we compute
Then we use the other given relations
Which all implies
Let such that
In terms of the unit coordinate vectors compute the cross product
Using part (a) of the previous exercise and equation (13.10) on page 490 of Apostol () we compute
Then we use the other given relations
Which all implies