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3: Use the Laplace transform and unit step functions to solve the IVP: \begin{array}{l} y^{\prime \prime}+y=g(t) ; \quad y(0)=0, y^{\prime}(0)=1 \\ g(t)=\left\{\begin{array}{ll} 1, & 0 \leq t<3 \pi \\ 0,

& 3 \pi \leq t<\infty \end{array}\right. \end{array}

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