Find the second-order partial derivative.Find fxy when f(x,y) = 10x2y4 - 7x3y5.
A. 160xy3 - 21x2y4
B. 80xy3 - 21x2y4
C. 160xy3 - 105x2y4
D. 80xy3 - 105x2y4
Answer: D
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What will be an ideal response?