Consider the integral equation: f(t) - 35e-17t = 19t ² - L' sen( sen(t - u)f(u)du By applying the Laplace transform to both sides of the above equation, it is obtained that the numerator of the function F(s) is of the form (a₂s² + a₁s + ao) (s² + 1), where F(s) = L {f(t)} then the value of an is equal to:

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