T: R3 †’ R3 is the orthogonal projection on the x,y-plane; B and B€² are as in Exercise 4.
Find the matrix of T with respect to the basis B, and use Theorem 8.5.2 to compute the matrix of T with respect to the basis B€².
Exercise 4
T: R3 †’ R3 is defined by

B is the standard basis for R3 and B€² = {v1, v2, v3}, where

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