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0 votes
5.7k views
in Differentials and Partial Derivatives by (49.2k points)
closed by

If f(x, y, z) = xy + yz + zx, then fx – fz is equal to …

(a) z – x 

(b) y – z 

(c) x – z 

(d) y – x

1 Answer

+1 vote
by (47.0k points)
selected by
 
Best answer

(a) z – x 

fx = y + z 

fz = y + x 

fx – fz = y + z – y – x = z – x

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