- #1
chickens
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Homework Statement
L[cos(at)cosh(at)] = ?
Homework Equations
L[cos(at)] = s/(s^2 + w^2)
The Attempt at a Solution
I'm able to get the solution given that is (s^3)/(s^4 + 4a^4)
The question requested to use first shift property. So I used cosh(at) = 1/2[e^at + e^(-at)]
but now I'm trying to use another method.
if you use euler's rule, you can also get cos(at) = cosh(at) = 1/2[e^at + e^(-at)]
then simply multiply them and get L[e^2at + 2 + e^(-2at)] but I don't seem to get the same solution as above, any ideas?