一道高数题,

问题描述:

一道高数题,
∫[1/(1+x^4)]dx

∫[1/(1+x^4)]dx= 1/2∫[(x^2+1)-(x^2-1)]/(1+x^4)dx= 1/2 {∫(x^2+1)/(1+x^4) dx - ∫(x^2-1)/(1+x^4)dx }= 1/2 {∫(1+1/x^2)dx /(x^2+1/x^2) - ∫(1-1/x^2)dx/(x^2+1/x^2)}= 1/2 {∫d(x-1/x) /[(x-1/x)^...