I want to show $\displaystyle \sum_{n=2}^{\infty}\frac{\cos nx}{\log n}$ is a Fourier series but i am stuck how to show the given series is a Fourier series. Can anybody help me?
2026-05-06 07:15:58.1778051758
To show $\displaystyle\sum_{n=2}^{\infty}\frac{\cos nx}{\log n}$ is a Fourier series.
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