1. What is the best method to use given a differential equation with f(x) = sec x? A. Method of Undetermined Coefficients C. Both B. Method of Variation of Parameters D. None of the choices 2. What is the form of y, given (D² +9)y = e²x? Yp = A + e²x Yp = A + Be²x 3. A. B. C. D. What is the form of y, given (D² +9)y = cos3x A. Ур = Asinx + Bcosx B. Yn Asin3x + Bcos3x C. D. Yp = Ae²x Yp = A + Bex Yp = x(Asin3x + Bcos3x) Yn = x² (Asin3x + Bcos3x)

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