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**[URGENT] Rotation Matrices**

## Homework Statement

http://e.imagehost.org/0661/Screen_shot_2010-03-09_at_12_37_44_AM.png [Broken]

## Homework Equations

Rotation Matrix:

cos(theta) -sin(theta)

sin(theta) cos(theta)

## The Attempt at a Solution

I understand 2a:

cos(pi/4) -sin(pi/4)

sin(pi/4) cos(pi/4)

But I am not sure what 2b is looking for. Please help?

Thank you in advance for your help!

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