For nos.2-7, do NOT integrate anymore. Just use the Laplace Formulas directly. If needed, apply the trigonometric identities first [ For example, cos(A+B) = cosAcosB - sinAsinB] before using the Laplace formulas. (v2) t %3D For no.3, V2t means Find L{f (t)}of the following functions. Note: a, b, e, k and n are constants. 7. f(t)=3e" cosh (In 21) in two ways. -2t

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