>>294

(2-2x)/(x^2(x^2+2)) =-(x-1)/x^2 +(x-1)/(x^2+2)
=-1/x +1/x^2 +x/(x^2-1) - 1/(x^2+2)

x/(x^2+2) は(1/2)log(x^2+2)の微分
1/(x^2+2) は(√2/2)arctan(x/√2)の微分