求不定积分∫xarctanxdx

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/28 17:15:10
求不定积分∫xarctanxdx
x){Ɏާf=_iGۣE%y)6IEaPDBAK*UI5*Ԕ -4H"0U @.D$P#T$m0U '׌ (nI1)@H

求不定积分∫xarctanxdx
求不定积分∫xarctanxdx

求不定积分∫xarctanxdx
∫ x * arctanx dx
= ∫ arctanx d(x²/2)
= (x²/2)arctanx - (1/2)∫ x² d(arctanx)
= (x²/2)arctanx - (1/2)∫ x²/(x² + 1) dx
= (x²/2)arctanx - (1/2)∫ (x² + 1 - 1)/(x² + 1) dx
= (x²/2)arctanx - (1/2)∫ dx + (1/2)∫ dx/(x² + 1)
= (x²/2)arctanx - x/2 + (1/2)arctanx + C