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Home > PC > Chapter 12 > Lesson 12.2.2 > Problem 12-51

12-51.

Earlier we found the matrix associated with the composition of rotating counterclockwise and then reflecting across the -axis. Now find the matrix associated with reflecting across the -axis and then rotating .

From problem 12-45:
matrix associated with counterclockwise rotation
martix associated with reflecting across the -axis

Multiply and in the opposite order you did in problem 12-45. That is, find .