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Old December 1st, 2008, 06:54 PM
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(i)f^{-1}*is a reflexion with respect to the line y=x. Therefore, a point (a,b) becomes (b,a).
But here you have f^{-1} -9, so the symmetry acts and there is a translation of 9 in the negative y-axis direction.
Therefore, a point (a,b) becomes (b,a-9).

Last edited by vincisonfire; December 1st, 2008 at 07:04 PM.
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