UPSC NDA I 2014 Mathematics Paper

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Question : 43 of 120

Marks: +1, -0

If x and y are positive and xy>1, then what is tan−1x+tan−1y equal to ?

[NDA I 2014]

tan−1(
x+y
1−xy
)
π+tan−1(
x+y
1−xy
)
π−tan−1(
x+y
1−xy
)
tan−1(
x−y
1+xy
)

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