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Let f(x)=(ax + b )/(cx+d). Then the fof ...

Let `f(x)=(ax + b )/(cx+d)`. Then the `fof (x)=x`, provided that : `(a!=0, b!= 0, c!=0,d!=0)`

A

a=b=c=d=1

B

a=b=1

C

a=d

D

a=-d

Text Solution

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The correct Answer is:
D
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