Toronto Math Forum

MAT244--2020F => MAT244--Lectures & Home Assignments => Chapter 4 => Topic started by: Jiayi Wang (Ivy) on November 17, 2020, 07:21:33 PM

Title: Section 4.4 Past Final Exam Question
Post by: Jiayi Wang (Ivy) 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.
Title: Re: Section 4.4 Past Final Exam Question
Post by: Qi An on November 22, 2020, 12:11:34 AM
I get C1 = 10e^(-t) + 10arctan(e^t) + C1 and C2 = -4e^(-2t) + 4In|e^(2t)+1| + C2. I think there might be a typo here.
Title: Re: Section 4.4 Past Final Exam Question
Post by: Victor Ivrii on November 22, 2020, 05:19:33 AM
There could be misprints