### Author Topic: Section 4.4 Past Final Exam Question  (Read 2920 times)

#### Jiayi Wang (Ivy)

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##### 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.
« Last Edit: November 17, 2020, 07:24:08 PM by Jiayi Wang (Ivy) »

#### Qi An

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##### Re: Section 4.4 Past Final Exam Question
« Reply #1 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.

#### Victor Ivrii

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##### Re: Section 4.4 Past Final Exam Question
« Reply #2 on: November 22, 2020, 05:19:33 AM »
There could be misprints