Mathematics - I (3110014) MCQs

MCQs of Partial Derivatives

Showing 41 to 43 out of 43 Questions
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41.

If f(x,y)=cos(xy) then the value of fx(π,1) is _____.

(a)

0
(b)

1
(c)

-1
(d)

2.5
Answer:

Option (a)

42.

The equation of the tangent plane to the surface 2x2+y2+2z=3 at point (2,-1,-3) is _____.

(a)

4x+y-z=-6
(b)

x+4y-z=6
(c)

4x-y+z=6
(d)

x+y+4z=6
Answer:

Option (c)

43.

Conditions for f(x,y) to have a minimum values are _____.

(a)

fx=0=fy, rt<s2, r<0
(b)

fx=0=fy, rt>s2, r<0
(c)

fx=0=fy, rt>s2, r>0
(d)

fx=0=fy, rt=s2, r>0
Answer:

Option (c)

Showing 41 to 43 out of 43 Questions
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