呵,偷懒用matlab算了下,很长的式子啊
结果是：log(x-1)/3 - log(x^2+x+1)/6 + (3^(1/2)*atan((8*3^(1/2))/(3*(6*x-4)) + (2*3^(1/2)*x)/(3*(6*x-4))))/3