急,这题不定积分怎么求
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运用分部积分法
∫arctan(1–x)dx
=x·arctan(1–x)–∫xd[arctan(1–x)]
=x·arctan(1–x)+∫x/(x²–2x+2) dx
=x·arctan(1–x)+∫(x–1)/(x²–2x+2) dx+∫1/[1²+(x–1)²]dx
=x·arctan(1–x)+ln∨(x²–2x+2)+arctan(x–1)+C
=(x–1)·arctan(1–x)+ln∨(x²–2x+2)+C
∫arctan(1–x)dx
=x·arctan(1–x)–∫xd[arctan(1–x)]
=x·arctan(1–x)+∫x/(x²–2x+2) dx
=x·arctan(1–x)+∫(x–1)/(x²–2x+2) dx+∫1/[1²+(x–1)²]dx
=x·arctan(1–x)+ln∨(x²–2x+2)+arctan(x–1)+C
=(x–1)·arctan(1–x)+ln∨(x²–2x+2)+C
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