Find the indicated derivative.Find fx  f(x,y,z) = 5x4y4 + 8x10z6 + 10y4

A. 20x3 + 80x9 
B. 20x3y4 + 80x9z6 
C. 80x3y3 + 480x9z5
D. 20x4y3 + 48x10z5 


Answer: B

Mathematics

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