求不定积分∫x/(x²+2x+2)dx
问题描述:
求不定积分∫x/(x²+2x+2)dx
答
∫x/(x²+2x+2)dx=1/2*∫(2x+2-2)/(x²+2x+2)dx
=1/2*∫(2x+2)/(x²+2x+2)dx-∫1/(x²+2x+1+1)dx
=1/2ln(x²+2x+2)+arctan(x+1)+C