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In the space R^3 with the dot product, the subspace V1 is give by V1 =...

In the space R^3 with the dot product, the subspace V1 is give by V1 = {(x1,x2,x3) : x1 + 2x2 = 2x3} Find the element in V1 which is closest to z=(1,1,1).

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