解ï¼ç¨åé¨ç§¯åæ³æ±è§£ã
åå¼=(1/2)(xarctanx)^2-â«[(x^2/(1+x^2)]arctanxdx=(1/2)(xarctanx)^2-â«[1-1/(1+x^2)]arctanxdxã
èï¼â«[1-1/(1+x^2)]arctanxdx=â«arctanxdx-(1/2)(arctanx)^2=xarctanx-(1/2)ln(1+x^2)-(1/2)(arctanx)^2+C1ï¼
â´åå¼=(1/2)(1+x^2)(arctanx)^2-xarctanx+(1/2)ln(1+x^2)+Cã
ä¾åèã
温馨提示:答案为网友推荐,仅供参考