# If r2=(x-a)2+(y-b)2 then rxx+ryy=

1.  1/r

2.  1/r2

3.  r2

4.  r

4

1/r

Explanation :
No Explanation available for this question

# If u=log(x3+y3+z3-3xyz) then

1.  19/(x+y+z)3

2.  -9/(x-y-z)2

3.  -9/(x+y+z)2

4.  9/(x+y+z)2

4

-9/(x+y+z)2

Explanation :
No Explanation available for this question

# If u=3(lx+my+nz)2-(x2+y2+z2) and l2+m2+n2=1 then uxx+uyy+uzz=

1.  0

2.  u

3.  2u

4.  None

4

0

Explanation :
No Explanation available for this question

# If a2x2+b2y2=c2z2 then

1.  1/z2

2.  1/c2z

3.  1/z

4.  1

4

1/c2z

Explanation :
No Explanation available for this question

# If

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# If Z=1n(1+xr+yr) then Zxy=

1.  -Zx Zy

2.  Zx Zy

3.  Zx2

4.  Zy2

4

-Zx Zy

Explanation :
No Explanation available for this question

# If,then uxy(0,0)=

1.  1

2.  0

3.  π/4

4.  π/2

4

1

Explanation :
No Explanation available for this question

# If V is the volume of a variable cone with base radius r and vertical height h then Vrh=

1.  2πr/3

2.  2π/3

3.  2πh/3

4.  None

4

2πr/3

Explanation :
No Explanation available for this question

# If F=x2yz-2xz3+xz2 then at (1,0,-2) is

1.  0

2.  4

3.  -4

4.  None

4

-4

Explanation :
No Explanation available for this question

1.  0

2.  1

3.  -1

4.  2

4