1.求下列各函数的一阶偏导数:-|||-(1) =(x)^2ln ((x)^2+(y)^2);

设函数y=f(x)由方程(y)^2+(y)^2ln x-4=0所确定,则(y)^2+(y)^2ln x-4=0= ( )(y)^2+(y)^2ln x-4=0(

1.求下列函数的高阶偏导数:-|||-(1) =(x)^4+(y)^4-4(x)^2(y)^2 ,所有二阶偏导数;-|||-(2) =(e)^x(cos y+x

1.求下列复合函数的偏导数或导数:-|||-(1)设 =arctan (xy) ,y=e^x, 求 dfrac (dx)(dx)-|||-(2)设 =dfrac

1.求函数的二阶导数:-|||-(1)y=2(x)^2+ln x;-|||-(2)y=(e)^2x-1,-|||-(3) =xcos x ;-|||-(4) =

1.求下列函数的二阶导数:-|||-(12) =ln (x+sqrt (1+{x)^2}).

求下列复合函数的偏导数或导数:-|||-(1)设 =arctan (xy) ,y=e^x, 求 dz/dx;-|||-(2)设 =dfrac ({x)^2+(y

求函数 (x)=(x)^2ln (1+x) 在 x=0 处的n阶导数 (n)(0)(ngeqslant 3

求下列函数的二阶导数:-|||-(1) =(cos )^2xcdot ln x;-|||-(2) =dfrac (x)(sqrt {1-{x)^2}}

7.求由下列方程所确定的隐函数 =f(x,y) 的偏导数-|||-(1) ^2+(y)^2+(z)^2-4z=0;7.求由下列方程所确定的隐函数 =f(x,y)

设=u(√x^2+ y^2)有二阶连续偏导数，且满足=u(√x^2+ y^2)，=u(√x^2+ y^2)。（I）求=u(√x^2+ y^2)；（II）求=u(