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pi/2-sum[(π sinh(n)-(1/2 e^n (π + i Ei(-n)) - 1/2 i e^(-n) Ei(n)))/n!,{n,1,500}]
pi/2-sum[(π sinh(n)-(1/2 e^n (π + i Ei(-n)) - 1/2 i e^(-n) Ei(n)))/n!,{n,1,500}]
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