(a) Assume that Theorem 7.3.1 holds when the symbol a is replaced by ki, where k is...

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(a) Assume that Theorem 7.3.1 holds when the symbol a is replaced by ki, where k is a real number and i2 = -1. Show that ℒ{tekti} can be used to deduce

- k L{t cos kt} (s? + k2)? 2ks L{t sin kt} (s? + k)2


(b) Now use the Laplace transform to solve the initial value problem x'' + ω2x = cos ωt, x(0) = 0, '(0) = 0.


Theorem 7.3.1

If ℒ{f(t)} = F(s) and a is any real number, then

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