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**1. how do i solve**

X'(t)=A(t)X(t)

X'(t)=A(t)X(t)

## Homework Equations

I know of this equation:

[itex]x(t) = x_0 \exp\left( \int_{t_0}^t f(\xi) \, d\xi \right)[/itex]

but i think that i'm using it wrong.

## The Attempt at a Solution

i have the following mathematica code:

A=

x = MatrixExp[Integrate[A, {t, 0, s}]].{1, 0,0,0};

Plot[x[[2]] + x[[4]], {s, 0, 500}]

the problem is, that the result i get it not the same as when i numerically plot it with matlab, wich leads me to believe that i'm doing something wrong.

any kind of help would be greatly appreciated,

Thanks

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