y U(v) 4 2 -2 6. -2 An important linear transformation in calculus is the reflection U in the line y = x, since this corresponds to taking the inverse of a function. For example U( 1 |3| and in general %3D The matrix that represents U is A = ? This matrix has the property that A as do all 2 x 2 reflection matrices. - H -+T H-

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