Solving linear DE systems using fundamental matrix

member 731016
Homework Statement
Please see below
Relevant Equations
Please see below
For this problem,
1715410731470.png


I am confused by the term below. I get all their terms, expect replacing the highlighted term by ##e^{3t}##, does someone please know whether this is yet another typo?

Thanks!
 
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Obviously a typo. And not the first one …
 
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Orodruin said:
Obviously a typo. And not the first one …
Thank you for your reply @Orodruin! Do you also please know why they include a comma in the matrix fundamental matrix? It seems a strange use of notation to mean.

Thanks!
 

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