### Author Topic: TT2A-P1  (Read 6432 times)

#### Victor Ivrii

• Elder Member
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##### TT2A-P1
« on: November 20, 2018, 05:47:57 AM »
(a) Find the general solution of
\begin{equation*}
y''-4y=2\tanh (t).
\end{equation*}

(b) Find solution, such that $y(0)=0$, $y'(0)=0$.

#### Jiabei Bi

• Jr. Member
• Posts: 7
• Karma: 10
##### Re: TT2A-P1
« Reply #1 on: November 20, 2018, 12:34:21 PM »

#### Xu Zihan

• Jr. Member
• Posts: 7
• Karma: 4
##### Re: TT2A-P1
« Reply #2 on: November 20, 2018, 01:16:03 PM »
Here is my answer, somewhere different from Jiabei's.
« Last Edit: November 20, 2018, 01:20:54 PM by Xu Zihan »

#### Zhiqiu Ye

• Newbie
• Posts: 1
• Karma: 3
##### Re: TT2A-P1
« Reply #3 on: November 20, 2018, 01:32:04 PM »
This is my answer, it is little bit different than Jiabei's answer.

#### yukeqi957

• Newbie
• Posts: 1
• Karma: 0
##### Re: TT2A-P1
« Reply #4 on: November 20, 2018, 01:55:31 PM »
this is my answer, a bit different from Jiabei,bi.

#### Victor Ivrii

Zhiqiu is right. No $\arctan$ in the answe.