7. For R, let A = Ag = cos sin sin 0 cos sin 0 and B Be= 86). cos cos sin (a) Show that B has an eigenvector v = (cos(0/2), sin(0/2)) with eigenvalue 1, and a second, orthogonal, eigenvector with eigen- value -1. Conclude that this matrix represents a reflection in the line tha li 9/9

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