Find the gradient ?f.f(x, y, z) = x2y + y2z + z7x
A. (2xy + z7)i + (2yz + x2)j + (7xz6 + y2)k
B. (2xy + z7y)i + (2yz + x2)j + (7xz6 + y2)k
C. (2xy + z7)i + (y2z + x2)j + (7xz6 + y2)k
D. (x2y + z7)i + (2yz + x2)j + (7xz6 + y2)k
Answer: A
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