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Mathematics
Problem
Under what conditions is the rational function
y
=
a
x
+
b
c
x
+
d
y = \frac{ax+b}{cx+d}
y
=
c
x
+
d
a
x
+
b
,
c
≠
0
c \neq 0
c
=
0
, a self-inverse function?
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