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Here is my problem.

Let u=(1.2.0), v=(0,0,3), and w=(0,1,0) are vectors in R^3.

Evaluate, if defined, the following expretions (if undefined state so)

a) (u * v)w

b) u+w*v

c) (u * u)/w

d) (v * v)/(w * w)

Should I try to calculate them or just tell if expretion is defined or undefined?

How can I tell if expretions above are defined?