TT2A-P1

[Victor Ivrii]

(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]

This is my answer, thx

[Xu Zihan]

Here is my answer, somewhere different from Jiabei's.

[Zhiqiu Ye]

This is my answer, it is little bit different than Jiabei's answer.

[yukeqi957]

this is my answer, a bit different from Jiabei,bi.

[Victor Ivrii]

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