find the general solution of the given equation.

1. y′′ + 9y = 0

2. y′′ + 25y = 0

3. y′′ - 2y′ + 5y = 0

4. y′′ + 2y′ + 4y = 0

5. y′′ + 4y′ + 9y = 0

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