Question: In Exercises find
(a) the cartesian equation of the plane containing the given points, and
(b) a unit vector normal to the plane.
Prove result (b) of Theorem
Theorem: Vector triple products If a, b, and c are any three vectors, then
(a) a x (b x c) = (a . c)b - (a . b)c, and
(b) (a x b) x c = (a . c)b - (b .c)a