WBJEE 2015 Math Solved Paper

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Question : 27 of 80

Marks: +1, -0

If y = e–x cos2x then which of the following differential equations is satisfied ?

d2y
dy2
+ 2
dy
dx
+ 5y = 0
d2y
dy2
+ 5
dy
dx
+ 2y = 0
d2y
dy2
- 5
dy
dx
- 2y = 0
d2y
dy2
+ 2
dy
dx
- 5y = 0

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