UPSC NDA 2 2017 Mathematics Solved Paper

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Question : 82 of 120

Marks: +1, -0

If y=cos−1(‌‌

2x

1+x2

) then

dy

dx

is equal to

[NDA II 2017]

−‌‌
2
1+x2
for all |x|<1
−‌‌
2
1+x2
for all |x|>1
‌‌
2
1+x2
for all |x|<1
None of the above.

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