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let f(0)=1, f'(0)=-1, F(s) = L{f(t)}(s), F''(s) = -9s/(s^2+9). find f(t)

let f(0)=1, f'(0)=-1, F(s) = L{f(t)}(s), F''(s) = -9s/(s^2+9). find f(t)

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