1. The problem statement, all variables and given/known data Find the components of A after a rotation of -45 degrees about X3. A=(1,1,2) 2. Relevant equations [tex]\lambda[/tex]= (cos[tex]\theta[/tex] 0 -sin[tex]\theta[/tex]) ( 0 1 0 ) (sin[tex]\theta[/tex] 0 cos[tex]\theta[/tex]) 3. The attempt at a solution Above is my attempt to show you guys the rotation matrix when rotated about the X3 axis. So my strategy was to plug in -45 degrees into the thetas. Once I got a value for each element in the matrix, I checked to see if A' was equal to A. However, I ended up getting A'=(0,SQRT(2),2). This does not equal A. Where did I go wrong? Any help would be much appreciated.