求下列不定积分:∫[(1+2x2)/x2(1+x2)]dx.
求下列不定积分:∫[(1+2x2)/x2(1+x2)]dx.
【正确答案】:∫=(1+2x2)/x2(1+x2)=∫[(1+x2)+x2]/[x2(1+x2)]dx=∫{1/x2+[1/(1+x22)]}dx=-(1/x)arctanx+c.
Top