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The differential equation obtained by el...

The differential equation obtained by eliminating a and b from `y=ae^(3x)+be^(-3x)` is

A

`(d^(2)y)/(dx^(2))-9y`

B

`(d^(2)y)/(dx^(2))+9y`

C

`y''-9y=0`

D

`y'=3ae^(3x)-3be^(-3x)`

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