UPSC NDA I 2012 Mathematics Paper

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Question : 81 of 120

Marks: +1, -0

If y=‌

x+1

x−1

, then what is ‌

dy

dx

equal to?

‌
−2
x−1
‌
−2
(x−1)2
‌
2
(x−1)2
‌
2
(x−1)

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