x=ln(1 t^2),y=arctant,求dy dx-搜答案-搜搜考试网

设y=ln ln ln x,求y’

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

y=ln(1+x^2),求y

y'=[1/(1+x^2)]*(1+x^2)'=[1/(1+x^2)]*2x=2x/(1+x^2)

求导y=ln ln ln(x^2+1)

y=ln(1-x^2)

chainruley=f(g(x))y'=g'(x)f'(g(x))

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(

表示以e为底的对数函数符号

dy/dx=[1-1/(1+t²)]/[2t/(1+t²)]=t/2d²y/dx²=(1/2)*dt/dx=(1/2)/(dx/dt)=(1/2)/[2t/(1

y=ln(1+t)t=e^y-1x=e^(2y)-e^y两边同时对x求导得dy/dx=1/(2e^(2y)-e^y)=1/(2(1+t)^2-1+t)=1/(2t^2+3t+1)

y=ln^2(1-x)求导

Y=[LN(1-X)]^2?Y'=2LN|1-X|/(1-X)(-1)=-2LN|1-X|/(1-X)

y=ln(1-x^2) 求y''

y=ln(1-x^2)y'=(1-x^2)'/(1-x^2)=-2x/(1-x^2)

明显你是对的.答案是哪里来的,明显不对.

y=ln(1+x^2)求导

2x/(1+x^2)

y=ln(2x^-1)求导

y'=ln(2x^-1)'=(x/2)*2*(-1)/x^2=-1/x

解答如图

y=ln(x+√x^2+1),求y

x≤0时√x^2=-x所以y=0x>0时√x^2=x所以y=ln（2x+1）

先分别求出dx/dt和dy/dt,假设A=dx/dt,B=dy/dt然后用B/A得出dy/dx设C=B/A=dy/dxC中只含有t.因此,d^2y/dx^2=C/dt乘以dx/dt的倒数（dt/dx）

分别算出dx,dy,然后相除就行详见参考资料

dx/dt=2t/(1+t²)dy/dt=1/(1+t²)dy/dx=1/(2t)d(dx/dt)/dt=(2-4t²)/(1+t²)²d(dy/dt

x=tany+ln(cosy^2),dy/dx=(dx/dy)^-1=(tany-1)^-2,y"=d(dy/dx)/dy*dy/dx=-2secy^2/(tany-1)^5