(4/Pi) Integrate[1/(Sqrt[2] (Cos[θ] + Sin[θ])) - d/2, {θ, 0, Pi/4}] == 0(4/Pi) Integrate[1/(Sqrt[2] (Cos[θ] + Sin[θ])) - d/2, {θ, 0, Pi/4}] == 0

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