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Find the entries of the following matrices:
(a) the 2 ×2 matrix M for the reflection across the line y = x.
(b) the 2 ×2 matrix N for the 90 degree counterclockwise rotation about the origin.
(c) the product MN;what transformation does this represent?
(d) the product NM; what transformation does this represent?
(e) the product MM; what transformation does this represent?

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