UPSC NDA 2 2016 Mathematics Solved Paper

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Question : 97 of 120

Marks: +1, -0

Which one of the following differential equations represents the family of straight lines which are at unit distance from the origin?

[NDA II 2016]

(y−x‌‌
dy
dx
)2=1−(‌‌
dy
dx
)2
(y+x‌‌
dy
dx
)2=1+(‌‌
dy
dx
)2
(y−x‌‌
dy
dx
)2=1+(‌‌
dy
dx
)2
(y+x‌‌
dy
dx
)2=1−(‌‌
dy
dx
)2

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