作业帮∫arctanxdx (x^2(1 x^2))
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/18 16:49:09
取x=sint+1(-pi/2
x^2/[(x-3)(x+2)^2=(9/25)[1/(x-3)]+(16/25)[1/(x+2)]-(20/25)[1/(x+2)^2].原式=(9/25)∫1/(x-3)dx+(16/25)∫1/
∫(x+1)/(x^2-2x+5)dx=1/2*∫(2x-2)/(x^2-2x+5)dx+∫2/(x^2-2x+5)dx=1/2*∫[1/(x^2-2x+5)]d(x^2-2x+5)+2∫1/[(x-
∫arccosxdx=xarccosx-∫-x/√(1-x^2)dx（分部积分法）=xarccosx-1/2∫d(1-x^2)/√(1-x^2)=xarccosx-√(1-x^2)+C∫sin(lnx
(x^2-x+6)/(x^3+3x)=2/x-(x+1)/(x^2+3).原式=∫2/xdx-∫(x+1)/(x^2+3)dx=2ln|x|-(1/2)ln(x^2+3)-(1/√3)arctan(x
你是问为什么∫du/(u²+a²)²=(1/2a²)[u/(u²+a²)+∫du/(u²+a²)],对吗?如果是这么个问
左边=∫x√(1-x^2)dx-∫x^2dx=-1/2∫√(1-x^2)d(-x^2)-x^3/3=-1/2*2/3*(1-x^2)^(3/2)-x^3/3+C=-1/3*(1-x^2)^(3/2)-
当x=0时,f(x)不连续,故f(x)的原函数分成两部分：x>0,∫f(x)dx=∫x㏑(1+x^2)dx=(1/2)∫㏑(1+x^2)d(x^2)=(1/2)ln|ln(1+x^2)|+C1x
[f(x)/f'(x)]'=[f'²(x)-f(x)f''(x)]/f'²(x)=1-f(x)f''(x)/f'²(x)因此题目中的被积函数为：[f(x)/f'(x)-f
∫x/[(x^2+1)(x^2+4)]dx=1/3∫x[1/(x^2+1)-1/(x^2+4)]dx=1/3[∫x/(x^2+1)dx-∫x/(x^2+4)dx]=1/3[1/2∫1/[(x^2+1)
∫f'(x)dx/1+f^2(x)=∫df(x)/[1+f^2(x)]=arctanf(x)+c=arctan(e^x/x)+c
∫2^x*3^x/(9^x-4^x)dx=∫(2/3)^xdx/[1-(4/9)^x]=[ln(2/3)]^(-1)∫d[(2/3)^x]/{1-[(2/3)^x]^2}={[ln(2/3)]^(-1
答案错的.正确的如下：原式=xarctanx-∫xd(arctanx)=xarctanx-∫x/(1+x²)dx=xarctanx-(1/2)∫1/(1+x²)d(x²+
∵(x^4-4x^2+5x-15)/[(x^2+1)(x-2)]=[(x^4+x²-5x²-5)+(5x-10)]/[(x²+1)(x-2)]=[x²(x&su
你的积分上下限可能写反了,我就照这样做：积分上限是3^0.5,积分下限是3^-0.5.原式=∫(1/√3,√3)x*arctanxdx=[x²arctanx/2]|(1/√3,√3)-1/2
[(x^3-2x^2+x+1)/(x^4+5x^2+4)]=1/(x^2+1)+(x-3)/(x^2+4).原式=∫1/(x^2+1)dx+∫(x-3)/(x^2+4)dx=arctanx+(1/2)
仔细点看!1.令u=x^2,e^xdx=d(e^x)=dv,原式=x^2e^x-2∫xd(e^x)=x^2e^x-2(xe^x-∫e^xdx)=x^2e^x-2(xe^x-e^x)+C2.原式=x^2