
Solve:
 \[
y”3y’+2y=0; y(0)=0, y'(0)=1;
\]  \[
y”+4y’+4y=0; y(0)=0, y'(0)=1;
\]  \[
y”+y=0; y(0)=0, y'(0)=1;
\]
 \[

Solve:
 \[
y”3y’+2y=te^te^{2t}; y(0)=0, y'(0)=1;
\]  \[
y”+4y’+4y=te^{2t}; y(0)=0, y'(0)=1;
\]  \[
y”+y=\cos(t)+t; y(0)=0, y'(0)=1.
\]
 \[
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