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  2. State the Laplace transforms of a few simple functions from memory. What are the steps of solving an ODE by the Laplace transform? In what cases of solving ODEs is the present method preferable to that in Chap. 2? What property of the Laplace transform is crucial in solving ODEs? = Explain. When and how do you use the unit step function and

  3. Hint 3: Use the sifting property of the delta function, which allows you to pull the function e i!t out of the integral while inserting the value of t at which the delta function has non-zero value.

  4. I. Laplace Transform 1. Find the Laplace transform of the following functions. (a) f t =sin 2t cos 2t (b) f t =cos2 3t (c) f t =te2tsin 3t (d) f t = t 3 u7 t (e) f t =t2u 3 t (f) f t ={1, if 0≤t 2, t2−4t 4, if t≥2 (g) f t ={t, if 0≤t 3, 5, if t≥3 (h) f t =

  5. Table of Laplace Transforms. In the table below c is a constant. The functions f and g are piecewise continuous functions of exponential type; F and G denote their Laplace transforms respectively. The Heavyside function u0(t) is defined to be equal to 1 for t > 0 and equal to 0 for t < 0, and δ0 denotes the δ-“function” at 0.

  6. Table of Laplace transforms. f(t) F(s) 1. sin at. cos at. ectf(t) tnf(t) f(t − c)uc(t)

  7. The Laplace method is advertised as a table lookup method, in which the solution y(t) to a di erential equation is found by looking up the answer in a special integral table.

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