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integral from 0 to (2 π) of (r - R cos θ) / (r^2 + R^2 - 2 R r cos θ)^(3/2), dθ
integral from 0 to (2 π) of (r - R cos θ) / (r^2 + R^2 - 2 R r cos θ)^(3/2), dθ
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