Q 2551301224.     If `y =e^(-x) cos 2x`, then which of the following
differential equation is satisfied?

WBJEE 2015
A

`(d^2 y)/(dx^2) + 2 (dy)/(dx) +5y =0`

B

`(d^2 y)/(dx^2) + 5 (dy)/(dx) +2y =0`

C

`(d^2 y)/(dx^2) -5 (dy)/(dx) -2y =0`

D

`(d^2 y)/(dx^2) +2 (dy)/(dx) -5y =0`

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