In this case, \(f_1(t) = e^{-3t} \sin(10t) \mu(t)\), where \(\mu(t)\) is the Heaviside step function. The Heaviside step function is 0 for \(t < 0\) and 1 for \(t \geq 0\), so it effectively makes the function \(f_1(t)\) zero for \(t < 0\). This means we can
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