Question

求1除以(1加x的三次方)的积分

Answer 1

1/(1+x^3)
=1/[(x+1)(x^2-x+1)]
=A/(x+1)+(Bx+C)/(x^2-x+1)
解得
A=1/3,B=-1/3,C=2/3
然后积分就可以了