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January 28, 2015

January 28, 2015

Posted by **jimmy** on Wednesday, October 27, 2010 at 4:01am.

please i need help. thanks

- college math -
**jai**, Wednesday, October 27, 2010 at 4:05amfirst, there is s-shifting here since e^4t is multiplied to cos(2t).

from e^4t, we know that a = 4,, and that L{cos 2t} = s/(s^2 + 4) , therefore:

L{e^4t(cos 2t)} = (s-a)/((s-a)^2 + 4) = (s-4)/((s-4)^2 + 4)

so there,, :)

- college math -
**Anonymous**, Wednesday, October 27, 2010 at 2:45pm(3m − 2n)(3m + 4n)

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