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

12-51.

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

*-axis and then rotating*

From problem 12-45: matrix associated with

*martix associated with reflecting across the*

*-axis*

Multiply and

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

*.*