integrate 1/(8*pi**2)*ln(21-4*(cos(x)+cos(y)+cos(x+y)))/ln(9/2) for x = 0..2pi and y = 0.. 2piintegrate 1/(8*pi**2)*ln(21-4*(cos(x)+cos(y)+cos(x+y)))/ln(9/2) for x = 0..2pi and y = 0.. 2pi

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