1.

Choose the correct answer . Which of the following differential equation has y = c_1e^x + c_2e^(-x) as the general solution ?

Answer»

`(d^2y)/(dx^2) + y = 0`
`(d^2y)/(dx^2) - y = 0`
`(d^2y)/(dx^2) + 1 = 0`
`(d^2y)/(dx^2) - 1 = 0`

ANSWER :B


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