Show that the graph of f−1 is the reflection of the graph of f through the line y = x by verifying the following conditions:
(1) If P(a, b) is on the graph of f, then Q(b, a) is on the graph of f−1.
(2) The midpoint of line segment PQ is on the line y = x.
(3) The line PQ is perpendicular to the line y = x.
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