sum[((-1/2)^n 2F1(1, 1, 2 - n, 1/3) sin(n π))/(3 π Γ(1 + n) - 3 n π Γ(1 + n)),{n,0.00001,20.00001}]sum[((-1/2)^n 2F1(1, 1, 2 - n, 1/3) sin(n π))/(3 π Γ(1 + n) - 3 n π Γ(1 + n)),{n,0.00001,20.00001}]

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