∫ln[x+(1+x^2)^(1/2)]dx(分部积分法怎么求)

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/10 23:10:56
∫ln[x+(1+x^2)^(1/2)]dx(分部积分法怎么求)

∫ln[x+(1+x^2)^(1/2)]dx(分部积分法怎么求)
∫ln[x+(1+x^2)^(1/2)]dx(分部积分法怎么求)

∫ln[x+(1+x^2)^(1/2)]dx(分部积分法怎么求)
∫ln[x+(1+x^2)^(1/2)]dx
=xln[x+(1+x^2)^(1/2)]-∫[x(1+x/(1+x^2)^(1/2)]/[x+(1+x^2)^(1/2)]dx
=xln[x+(1+x^2)^(1/2)]-∫[x/(1+x^2)^(1/2)]dx
=xln[x+(1+x^2)^(1/2)]-1/2∫(1+x^2)^(-1/2)d(1+x^2)
=xln[x+(1+x^2)^(1/2)]-(1+x^2)^(1/2)+C
=xln[x+√(1+x^2)]-√(1+x^2)+C

∫ln[x+(1+x^2)^(1/2)]dx
=xln[x+(1+x^2)^(1/2)]-∫xdln[x+(1+x^2)^(1/2)]
=xln[x+(1+x^2)^(1/2)]-∫x/[x+(1+x^2)^(1/2)]*[1+x/(1+x^2)^(1/2)]dx
=xln[x+(1+x^2)^(1/2)]-∫x/(1+x^2)^(1/2)dx
=xln[x+(1+x^2)^(1/2)]-(1+x^2)^(1/2)+C