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### Messages - Mengmeng Shang

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##### Home Assignment 3 / Re: S2.3 problem2(17)(18)
« on: January 31, 2019, 04:53:26 AM »
Dear professor,

do we always assume that x-ct < x+ct? or we have to take cases? thanks

2
##### Term Test 1 / Re: TT1 Problem 2 (morning)
« on: October 16, 2018, 11:32:56 AM »
$y'' - \frac{e^x-e^{-x}}{e^x+e^{-x}+2} y' - \frac{2}{e^x+e^{-x}+2}y = 0$

$W = Ce^{-\int{-\frac{e^x-e^{-x}}{e^x+e^{-x}+2}}dx} = C{e^x+e^{-x}+2}$

$take C =1, W = e^x+e^{-x}+2$

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##### MAT244--Misc / Re: quiz
« on: September 21, 2018, 09:14:04 PM »
Also will there be any modeling questions tested on the quiz? or just pure solving equations?

Thanks for your clarifications

4
##### MAT244--Misc / quiz
« on: September 21, 2018, 09:10:24 PM »
Dear Professor,
Will quiz one include chapter1 and chapter2.2?

Thanks

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