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Transformationshard
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Given the transformation T(x,y)=(ax+by,cx+dy)T(x, y) = (ax + by, cx + dy)T(x,y)=(ax+by,cx+dy), what condition on the matrix M=(abcd)M = \begin{pmatrix} a & b \\ c & d \end{pmatrix}M=(ac​bd​) ensures that the transformation preserves the orientation of any figure?