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**e^At problem!!**

1. Homework Statement [/b]

Hi

for given 4 by 4 matrix, say A, find the e[tex]^{At}[/tex]

which t is time variable.

**2. Homework Equations**

[tex]A= {\left(\begin{array}{cccc} 0 & a & 0 & 0 \\ -a& 0 & 0 & 0\\ 0 & 0 & 0 & a\\0 & 0 & -a & 0 \end{array}\right)t}Y(0)[/tex].

**3. The Attempt at a Solution**

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