If A = [(cosθ,-sinθ),(cosθ,sinθ)] then adj A is
(a) [(cosθ,-sinθ),(cosθ,sinθ)]
(b) [(1,0),(0,1)]
(c) [(cosθ,sinθ),(-sinθ,cosθ)]
(d) [(-1,0),(0,-1)]
Answer is (c) [(cosθ,sinθ),(-sinθ,cosθ)]
