Find the gradient ?f.f(x, y) = 
A. (x2 + y2)-2[y2(y2 - x2)i + 2x2yj]
B. (x2 + y2)2[y2(y2 - x2)i + 2x2yj]
C. (x2 + y2)-2[2x2yi + y2(y2 - x2)j]
D. (x2 + y2) [2x2yi + y2(y2 - x2)j]
Answer: A
Mathematics
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