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9y′−4y=e^−(πt/2), y(0)=a Let a0 be the value of a for which the transition from one type...

9y′−4y=e^−(πt/2), y(0)=a Let a0 be the value of a for which the transition from one type of long-run behavior to another occurs. Find the critical value a0 exactly. a0= ?

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