expand 1/2(-(5 π^2)/48 - (log^2(2))/2 + 3/4 log(2) log(1 + sqrt(2)) - 1/2 log^2(1 + sqrt(2))+1/2 dilogarithm(2-sqrt 2)-dilogarithm(-1-sqrt 2)+1/4 dilogarithm(-(1+sqrt 2)^2))

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