UPSC NDA I 2016 Mathematics Solved Paper

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Question : 5 of 120

Marks: +1, -0

If f(x1)−f(x2)=f(

x1−x2

1−x1x2

) for x1,x2∊(−1,1),then what is f(x) equal to ?

[NDA I 2016]

ln(
1−x
1+x
)
ln(
2+x
1−x
)
tan−1(
1−x
1+x
)
tan−1(
1+x
1−x
)

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