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. Abaixo seguem as contas:![\matcal{L}[cos(t)] = \int_{0}^{\infty} e^{-st}cosbt\hspace{2}dt = \lim_{A\to\infty} \int_{0}^{A} e^{-st}cosbt\hspace{2}dt](/local--math/eqs/7d8b5a579b5de7a42532719d8e6a02c0.png)
