If y=e^-x cos2x then which of the follow...

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

A

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

B

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

C

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

D

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

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The correct Answer is:

A

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