UPSC NDA II 2014 Mathematics Paper

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For the next three (03) items that follow:
Consider the function f(x)=
x−1
x+1
[NDA II 2014]
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Question : 23 of 120
 
Marks: +1, -0
What is ‌
f(x)+1
f(x)−1
+x
equal to?
[NDA II 2014]
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