1.

If f(x,y) is an image function of two variables, then the first order derivative of a one dimensional function, f(x) is:

A. f(x+1)-f(x)
B. f(x)-f(x+1)
C. f(x-1)-f(x+1)
D. f(x)+f(x-1)
Answer» B. f(x)-f(x+1)


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