A. 4V
B. V
C. 2V
D. V2
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=
If V is the volume of a rectangular box with edges x,y,z then Vxyz=
If f=x2yz+y2zx+z2xy then fxyz=
If z(x,y) is the implicit function defined by x3+y3+z3=3xyz then xzx+yzy=
If u=3(lx+my+nz)2-(x2+y2+z2) and l2+m2+n2=1 then uxx+uyy+uzz=
If Z=1n(1+xr+yr) then Zxy=