不定积分∫ [x^2/(x^2+1)]dx=

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不定积分∫[x^2/(x^2+1)]dx=不定积分∫[x^2/(x^2+1)]dx=不定积分∫[x^2/(x^2+1)]dx==∫[(x^2+1-1)/(x^2+1)]dx=∫[1-1/(x^2+1)

不定积分∫ [x^2/(x^2+1)]dx=
不定积分∫ [x^2/(x^2+1)]dx=

不定积分∫ [x^2/(x^2+1)]dx=
=∫ [(x^2+1-1)/(x^2+1)]dx
=∫ [1-1/(x^2+1)]dx
=x-arctanx

  意恐迟迟归。\x09\x09  报得三春晖。  明日歌(文嘉)