I have found the (complex) EMF of an RCL-circuit to be:

\[

\widetilde\varepsilon (t) = \frac{1}{6} - \sum\limits_{n = 1}^\infty {\frac{{\cos (\omega nt)}}{{n^2 \pi ^2 }}},

\]

where the "~" over the ε indicates that it is complex. I have to find the current of the circuit. How can I do that?

Thanks in advance.

Sincerely,

Niles.