1. The problem statement, all variables and given/known data Given the matrix A= -1/2 root(3)/2 root(3)/2 1/2 determine if the matrix is a rotation about the origin or a reflection about the positive x axis and find the angle between the that the line makes with the x-axis 2. Relevant equations 3. The attempt at a solution I found the det(A)=-1 can I concluded that the matrix reflects vectors? and also how do you find the angle? I tried doing projection onto the axis. but didnt get me anywhere please help..