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The general solution of the differential...

The general solution of the differential equation `(d^2y)/dx^2=e^(-3x)` is (A) `y=9e^(-3x)+C_1x+C_2` (B) `y=-3e^(-3x)+C_1x+C_2` (C) `y=3e^(-3x)+C_1x+C_2` (D) `y=e^(-3x)/9+C_1x+C_2`

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