題組內容

三、 (10%,計算題)
Consider the rotation by θ of real-valued vectors on a plane shown in the figure below. (Note that0 ＜ θ＜ 2π, and θ≠0 to avoid trivial situations.) 
6317f03551617.jpg

(C). (4%) Is the transformation matrix similar to the identity matrix? Why?