Find all the first order partial derivatives for the following function.f(x, y) = tan-1 (9x - 9y)
A. fx(x, y) = 
; fy(x, y) = 
B. fx(x, y) = 
; fy(x, y) = 
C. fx(x, y) = 
; fy(x, y) = 
D. fx(x, y) = 
; fy(x, y) = 
Answer: A
Mathematics
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