y=ln√1-x 1 x^2的二阶导数
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y=0.5(ln(1-x)+ln(1+x^2)y'=0.5(1/(1-x)+1/(1+x^2))y''=0.5(1/(1-x)^2-2x/(1+x^2)^2)x=0时y''=0.5
y=ln(a²-x²)dy/dx=dln(a²-x²)/d(a²-x²)*d(a²-x²)/dx=1/(a²-
y=ln(3x/(1+2x))=ln3x-ln(1+2x)y′=3/3x-2/(1+2x)=1/x-2/(1+2x)y′′=-1/x^2+4/(1+2x)^2
/>y=ln(1+x^2)y'=2x/(1+x^2)y''=[2(1+x^2)-2x(2x)]/[(1+x^2)^2]=(2+2x^2-4x^2)/[(1+x^2)^2]=2(1-2x^2)/[(1+
y=ln(x+1)的导数为y!=1/(x+1)y!的导数y!=-1/(x+1)^2即为y的二阶导数
y'=[ln(x+√(1+x²))]'=1/(x+√(1+x²))*[x+√(1+x²)]'=1/(x+√(1+x²))*[1+2x/2√(1+x²)
y'=1/[x+√(1+x²)]*[x+√(1+x²)]'=1/[x+√(1+x²)]*[1+2x/2√(1+x²)]=1/[x+√(1+x²)]*[
y'={(2-x)/(2+x)}{[-(2+x)-(2-x)]/(2+x)²}=4/(x²-4)y''=(-4乘以x2)/(x²-4)²=-8/(x²
两边关于x求导,注意y是x的函数y'cosy=[1/(x+y)]*(1+y').①解得y'=1/(x+y)÷[cosy-1/(x+y)].②对①两边关于x求导可得y''cosy-(y')²s
再问:Ϊʲô��Ӹ�����再答:倒数的除法运算。懂了?
y=0.5*[ln(1-x)-ln(1+x^2)]y'=0.5*[1/(x-1)-2x/(x^2+1)]哦,不好意思y''=(x^2-1)/[(x^2+1)^2]-1/[2*(x-1)^2]还用再进一
y=ln(x+√(1+x^2))y'=1/[x+√(1+x^2)]*[x+√(1+x^2)]'又∵[x+√(1+x^2)]'=1+(1/2)(1+x²)^(-1/2)*2x=1-x*(1+x
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
求一阶容易,求二阶更容易:y=ln[x+√(a+x)]dy/dx=1/[x+√(a+x)]*[1+2x/2√(a+x)]=1/[x+√(a+x)]*[√(a+x)+x]/√(a+x)=1/√(a+x)
y'=(1+x²)'/(1+x²)=2x/(1+x²)y"=[(1+x²)(2x)'-(1+x²)'(2x)/(1+x²)²=2(