DLMF:6.15.E3 (Q2308)

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DLMF:6.15.E3
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    n = 1 ( - 1 ) n Ci ( 2 π n ) = 1 - ln 2 - 1 2 γ , superscript subscript 𝑛 1 superscript 1 𝑛 cosine-integral 2 𝜋 𝑛 1 2 1 2 {\displaystyle{\displaystyle\sum_{n=1}^{\infty}(-1)^{n}\mathrm{Ci}\left(2\pi n% \right)=1-\ln 2-\tfrac{1}{2}\gamma,}}
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