19. Continue from Question t十八. Which of the following statements is/are true regarding
the solution y(t)?
(A) y'(1) =1
(B) y'(π) =1
(C) y"(1) = -1
(D) y"(π)=0

(E) None of the above is true.

15. Continue from Question +e. Find the particular solution of the second order system inequation (2) with initial conditions z(0) = 2, x'(0) = 12, y(0) = 1 and y'(0) = 6. Whichof the following statements is/are true?(A) .(B) (t)=2cos(6t) +2sin(6t).(C).(D) y(t) = cos(6t) + sin(6t).(E) None of the above is true.

16. Consider the following second order differential equation3t2y"(t) + sin(t)y'(t) - cos(t)w(t) =0. be two linearly independent Frobeniusseries solution for y(t) in the above differential equation when t ＞ 0. Assuming r1≥ r2and a0 = 1, which of the following statements is/are true regarding the solution y1(t)?(A) r1 =1.(B) (C) (D) (E) None of the above is true.

17.Continue from Question 十六.Assuming b0 = 2, which of the following statements is/aretrue regarding the solution y2(t)?(A) (B) b1=0(C)(D)(E) None of the above is true.

18.Consider the following differential equation for the function y(t) defined for t ≥ 0where u(t) is the usual unit-step (Heaviside) function and where * is the usual convolutionaloperation of two functions. Assume y(t) = 0 for t ＜ 0. Given the initial conditiony(0) = 1, which of the following staterents is/are true regarding the Laplace transformY(s) = ((t)] of solution y(t) in the above equation?(A) Y(s= )= -6(B) Y(s=1)=1(C) Y(s=2)=(D) Y(s=3)=(E) None of the above is true.

20、Consider the following partial differential equation for the bivariate function v(x, t), 0 ≤ x ≤ 10, t ≥ 0subject to conditionsExpress the solution v(x, t) in the following form for some constants ,  ∈ satisfying 0 ≤ r0＜r1＞r2＜... ＞ 0 for n = 1, 2,... Which of the following statements is/are true?(A)(B)(C) (D) (E) None of the above is true.

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