Question: Verify that the given function y is a solution of the initial value problem that follows it. y = -3 cos 3t; y(t) + 9y

Verify that the given function y is a solution of the initial value problem that follows it.

y = -3 cos 3t; y"(t) + 9y = 0, y(0) = -3, y'(0) = 0

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