Solving Linear Math Inverse Homework: A=4e^4txsin(4t)

[~Sam~]

Homework Statement

pt)
If A=
4e^4t x sin(4t) 4e^2t x cos(4t)
-3e^4t x cos(4t) 3e^2t x sin(4t)

Then A inverse is?

x= times
^=power

sorry for bad format

Homework Equations

Since it's 2x2 I know you can use the determinant equation 1/(ad-bc) ..etc

The Attempt at a Solution

Because of the weird variables I'm not sure how to simplify the multiplication when doing the determination equation.

 

[Hurkyl]

I assume you've have managed to get an answer that is correct, and are just looking for help simplifying?

Care to show us what you got? (Or, maybe just the expression you got for the determinant?)

 

[~Sam~]

I assume you've have managed to get an answer that is correct, and are just looking for help simplifying?

Care to show us what you got? (Or, maybe just the expression you got for the determinant?)

well the answer i got was long..i just subbed the variables in the equation.

 

[HallsofIvy]

?? You "subbed the variables" into what equation?

 

[willem2]

use $$sin^2(t) +cos^2(t) = 1$$