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The function is f(x) = 1/1+exp(x-1)/kt m=3/2 l=0 n=0 a=2 I should calculate the Fermi integral F(x) = integral[(-(df/dx)* x^n*(x+a*x^2)^m*[(1+2*a*x)^2+2]^l/2dx, 0, inf] I try to calculate in Mathematica, but the problem...