If \(f\left( x \right) = \frac{{ax + b}}{{cx + d}}\) and f(f(x)) = x then

If \(f\left( x \right) = \frac{{ax + b}}{{cx + d}}\) and f(f(x)) = x

1.	If \(f\left( x \right) = \frac{{ax + b}}{{cx + d}}\) and f(f(x)) = x then
A.	d = a
B.	d = - a
C.	a = b = c = d = 1
D.	a = c = 1
Answer» C. a = b = c = d = 1

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If \(f\left( x \right) = \frac{{ax + b}}{{cx + d}}\) and f(f(x)) = x then

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