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I do not know how to drive an experession for energy loss of damped oscillator.I know that:

X(t)=A exp(-Beta*t)cos(wt-delta)

and:

v=dx/dt........

I found E=K+U

but it seems to be so messy. It is like:

E=(1/2)*m*(A^2)*exp(-2*beta*t)[ beta^2 (cos(wt-delta))^2)+beta*

sin 2(wt-delta)+w^2 ]

I do not know if it is right or not but also I do not know how to get the energy loss from it.

I will thank for help.

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# Energy loss of damped oscillator

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