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n-1-1-n-Si-2pin-pi-2-n-

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Question Number 141312 by qaz last updated on 17/May/21
Σ_(n=1) ^∞ (−1)^n ((Si(2πn)−(π/2))/n)=?
$$\underset{{n}=\mathrm{1}} {\overset{\infty} {\sum}}\left(−\mathrm{1}\right)^{{n}} \frac{{Si}\left(\mathrm{2}\pi{n}\right)−\frac{\pi}{\mathrm{2}}}{{n}}=? \\ $$

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