a) Q.7) To write the power series m=3 Um as the form Em=2 Um , we must shift m to a) т- Q.8) The characteristic equation for y" + y' +y = 0 , is: a) 24: Q.9) The form of the particular solution of the equation y" + 9y = 4 sin 3x + 2cos3x, is: a) yp(x) = A cos3x c) yp (x) = A sin3x 00 100 b) т -2 с) т + 2 d) m +1 22 b) a* = -22 c) 1* +1 = -1 d) 2* + 1 = 1 b) yp(x) = A cos3x + Bsin3x d) y, (x) = Axcos3x + Bxsin3x %3D

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