A. u
B. 1
C. 0
D. None
If f(x,y,z)=√(yz)+ √(zx)+ √(xy) then xfx+yfy+zfz=
If au+b=a2x+y then uxuy=
If u=(y+sin x)3+(y-sin x)2,then uxx=
If u=(ax+by)2-(x2+y2) and a2+b2=1 then uxx+uyy=
If V=πr2h then rVr+2hVh=
If u=x2+y2+z2,x=et,y=et sin t,z=et cos t then du/dt=
If u3(1+a3)=8(x+ay+b)3 then u3x+u3y=
If f(x,y)=xy+(1/x)+(1/y) then fxx?fyy-fxy2 at (1,1) is
If r2=(x-a)2+(y-b)2 then rxx+ryy=
If f(x,y)=x2Tan-1(y/x)-y2 Tan-1(x/y),x≠0,y≠0 then fxy=