- #1

arcTomato

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**Homework Statement:**I don't know how can I derivation Eq.(2.2)

**Homework Equations:**Fourier coefficients

**Homework Statement:**I don't know how can I derivation Eq.(2.2)

**Homework Equations:**Fourier coefficients

Dear all.

I don't know how can I derivation Eq.(2.2).

Where Σk is come from??