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Consider the vectors a,b,c,d,e and f in the picture below:

We will project each of these vectors onto $$\mathbf{u} = \begin{pmatrix} 1\\ 2 \end{pmatrix}$$, pictured below:

There are two vectors in the list a,b,c,d whose projection onto u is themselves. Which two vectors are they?

Sep 18, 2020