Mathematics · Mathematical Methods in Physics
The function f(t) is a periodic function of period 2π. In the range (-π, π), it equals e-t. If f(t) = ∑-∞∞ cneint denotes its Fourier series expansion, the sum ∑-∞∞ |cn|2 is:
- 112π sinh(2π)✓
- 212π cosh(2π)
- 312π
- 41
Correct answer
12π sinh(2π)
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