Inverse of a weird looking matrix! (1 Viewer)

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1. The problem statement, all variables and given/known data

If A =

[ -4e^4t sin(9t) -4e^5t cos(9t) ]
[ 4e^4t cos(9t) 4e^5t sin(9t) ]

then what would A^-1 be?

I think I am mainly confused with the cos's and sin's...and all that other junk...since I know how to get the inverse of a regular matrix!

Thank you!

2. Relevant equations

3. The attempt at a solution
Use the rule of thumb for 2x2-matrix divide the matrix through its determinant change positions of a and d and put a minus sign at b and c.

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