UPSC NDA I 2019 Mathematics Solved Paper

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Question : 68 of 120

Marks: +1, -0

If y = acos 2x + b sin 2x , then

[NDA I 2019]

d2y
dx2
+ y=0
d2y
dx2
+ 2y=0
d2y
dx2
- 4y=0
d2y
dx2
+ 4y=0

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