Find the gradient ?f.f(x, y) = cos4(x6y6)
A. -24x5y6 cos3(x6y6) sin(-24x5y6)i - 24x6y5 cos3(x6y6) sin(x6y6)j
B. -24x5y6 cos3(x6y6) sin(x6y6)i - 24x6y5 cos3(x6y6) sin(x6y6)j
C. -24x5y6 cos3(x6y6) sin(x6y6)i - 24x6y5 cos3(x6y6) sin(x5y5)j
D. -24x5y6 cos3(x6y6) sin(x6y6)i - 24x6y5 cos3(x6y6) sin(-24x6y5)j
Answer: B
Mathematics
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2
A. c2 + 
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