Example Let 0 : R2 + R2 by a counterclockwise rotation of 6 radians about the origin. Find the standard matrix for 0. sin COS Bez 0 cos o sin a ei Recall (from a previous math course) that the point (,y) in the plane can be represented as (r cos 6,r sin e), for a positive value r e R. So the standard matrix for A is A = cose sina sin COS Example