The differential equation of the family ...

The differential equation of the family of curves y=a cos (x + b) is

A

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

B

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

C

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

D

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

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