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Messages - Jiayi Wang (Ivy)

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Chapter 4 / Section 4.4 Past Final Exam Question
« on: November 17, 2020, 07:21:33 PM »
I was working on the 2019-FE-P3, for the Problem3 of the Deferred section, I got C1=10e^(-t)+10arctan(e^t)+C1, C2=-4e^(-2t)+4ln(e^(-2t)+1)+C2
The answer shows C1=10e^(-t)+5arctan(e^t)+C1, C2=-4e^(-2t)-4ln(e^(2t)+1)+C2.
I was wondering if anyone got the same answer with me, thanks very much.

Chapter 4 / Section 4.3 Question5
« on: November 03, 2020, 04:32:16 PM »
For this question, I got the homogeneous solution: y(t)=c1+tc2+e^(2t)c3+e^(-2t)c4 ;
Then I set the particular solution as Yp(t)=t^2(at^2+bt+c)+de^t;
I am not sure the part t^2(at^2+bt+c) is correct or not. Can someone please help? Thanks!

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