### Recent Posts

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91
##### Test 4 / TT4 Alt G Q2
« Last post by Xiao Lu on December 03, 2020, 12:41:49 PM »
Questions and solutions attached below.
92
##### Test 4 / Re: TT3 main B Q2
« Last post by Zhiyue Yu on December 03, 2020, 08:37:08 AM »
It's TT4, typed by mistake.
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##### Test 4 / TT3 main B Q2
« Last post by Zhiyue Yu on December 03, 2020, 08:36:02 AM »
Here is the question and answer attached below, for Q2:
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##### Test 4 / TT4- main B Q1
« Last post by Zhiyue Yu on December 03, 2020, 08:35:28 AM »
Here is the question and answer attached below, for Q1:
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##### Test 4 / Re: Spring 2020 Test 2 Monday Sitting Problem 3
« Last post by Xuefen luo on December 03, 2020, 03:28:54 AM »
I got that there is no restriction on the n when z=2n𝜋, and n ≠ 0 & -1 when  z=(2n+1)𝜋
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##### Test 4 / Spring 2020 Wednesday Sitting Q4
« Last post by Darren Zhang on December 03, 2020, 12:52:15 AM »
For question b in Q4, could anyone explain how we get this?

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##### Test 4 / Re: Spring 2020 Test 2 Monday Sitting Problem 3
« Last post by Jiaqi Bi on December 02, 2020, 03:34:35 PM »
What I got on these poles were the same as you did $n \neq 0\ \& -1$. I believe that was a typo.
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##### Chapter 7 / Re: Drawing phase portrait with complex eigenvalues question
« Last post by Victor Ivrii on December 01, 2020, 08:46:13 PM »
"How ellipses wouls look like" means the directions and relative size of their semi-axis. See frame 4 of MAT244_W8L3 handout
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##### Test 4 / Spring 2020 Test 2 Monday Sitting Problem 3
« Last post by Xinxuan Lin on December 01, 2020, 01:42:57 PM »
f(z) = (z$^4$ -$\pi^4$)tan$^2$($\frac{z}{2}$)

Part b of this question is asking to determine the types of the singular point.

In solution, it says z=2n$\pi$ with n$\neq$ $\pm$ 1 are double zeros; z=(2n+1)$\pi$ with n$\neq$ $\pm$ 1 are double poles.

Could anyone explain why n$\neq$ $\pm$ 1 here? Why is not n$\neq$ -1, 0?