Essay
Assume that the relation - 65 +
= 0 defines z as a differentiable functionof x and y near the point (x , y) = (4 , 0).
(a) If z = f(x , y) , find and
at (x,y) = (4 , 0).
(b) If x = +
, y =
, find
at (u , v) =(0 , 2)\.
Hints :Part (a): First , find the value of z at (x , y) =(4 , 0).
Part (b): Use the chain rule!
Correct Answer:

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Correct Answer:
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