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Transformationshard
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If a transformation T(x,y)=(Ax+By+e,Cx+Dy+f)T(x, y) = (Ax + By + e, Cx + Dy + f)T(x,y)=(Ax+By+e,Cx+Dy+f) is an isometry, which of the following conditions must the matrix M=(ABCD)M = \begin{pmatrix} A & B \\ C & D \end{pmatrix}M=(AC​BD​) satisfy?