arctany除以x=ln-搜答案-灵鹊做题网

两边对x求导得1/[1+(y/x)^2]*(y/x)'=1/[ln(x^2+y^2)]*[ln(x^2+y^2)]'1/[1+(y/x)^2]*(y'x-y)/x^2=1/[2ln(x^2+y^2)]

设y=ln ln ln x,求y’

y'=(lnlnx)'/lnlnx=(lnx)'/lnxlnlnx=1/xlnxlnlnx

1/2*ln(x^2+y^2)=arctany/x两边对x求导,得1/2*1/(x^2+y^2)*(2x+2y*y')=1/[1+(y/x)^2]*(y'*x-y)/x^2化简得y'=(x+y)/(x

y+arctany-x=0dy/dx+1/(1+y^2)dy/dx-1=0dy/dx(1+1/(1+y^2)=1dy/dx=(1+y^2)/(2+y^2)

由题意得：y的方程式可以写为y=[1/根号下（1-x）]*[ln根号下(1+x)]求导y'=[1/根号下（1-x）]'*[ln根号下(1+x)]+[1/根号下（1-x）]*[ln根号下(1+x)]=[

y''=-(2+2y^2)/y

求导y=ln ln ln(x^2+1)

y=ln[ln(ln x)] 求导

复合函数f(x)=lnxg(x)=ln[ln(x)]r(x)=ln{lnln(x)]}r'(x)=[1/lnln(x)]g'(x)=[1/lnln(x)][1/ln(x)]f'(x)=[1/lnln(

y=(1+x)⁻¹ln(1-x)y'=(-1)(1+x)⁻²ln(1-x)+(1+x)⁻¹(1-x)⁻¹(-1)

x+arctany=y两边对x求导有：1+y'/(1+y²）=y'整理得：y'=1+1/y²

设y=2arctan(y/x),求dy/dx,d²y/dx².设F(x,y)=y-2arctan(y/x)=0,则dy/dx=-(∂F/∂x)/(ͦ

ln(x-y)/ln(x+y)=ln(x-y-x-y)=ln(-2y)

答案在插图：

1,y=ln(1-x)y'=1/(1-x)*(1-x)'=1/(1-x)*(-1)=1/(x-1);2,y=ln[1/√(1-x)]=-ln√(1-x)y'=-1/√(1-x)*[√(1-x)]'=-

见图再问：不好意思啊~题目看错了，题目如图啊~

1.y=arcsin(cosx)y'=[1/√（1－cos²x）](-sinx)=-sinx√（1－cos²x）/sin²x＝－|sinx|/sinx∴当sinx＞0时y

设z=arctany/x,求dz?

是(arctany)/x还是arctan(y/x)?如果是z=(arctany)/x,则∂z/∂x=-(arctany)/x²∂z/∂y=1/

利用查表或反函数求导法可求得(arctanu)'=1/(1+u^2)∴上述方程两边分别对x求导可得1+y'=y'/(1+y^2)=>(1+y^2)+(1+y^2)y'=y'=>(1+y^2)+y^2y

左右2边取正切,左边=(X+Y)/(1-XY)=右边.左边=arctan[(X+Y)/(1-XY)+Z]/[1-(X+Y)Z/(1-XY)]=arctanc(X+Y+Z-XYZ)/[1-XY-(X+Y

❶证明：tan(arctanX+arctanY)=(X+Y)/(1-XY)证明：tan(arctanx+arctany)=(tanarctanx+tanarctany)/[1-(tana