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9) Find the maximal interval of existence, I, for each IVP given. A) (t^2 − 9)...

9) Find the maximal interval of existence, I, for each IVP given.
A) (t^2 − 9) y′ − 7t^3 =√t, y(−2) = 12


B) sin(t) y′′ + ty′ − 18y = 1, y(4) = 9, y′(4) = −13

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