Answer to Question #82697 in Differential Equations for prince

Question #82697

The solution of ∂2/∂x∂y (ϕA) at the point (2, -1, 1) of the function ϕ(x,y,z)=xy^2z and A=xzi-xy^2j+xz^2 is ________
A. 4i-2j
B. 5i+6j
C. 3i-2k
D. 3i+3j

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