3. Given x(r,0) = r cos e and y(r,@) =r sin@ then use the chain rule to write (r cos 0, r sin@). 4. The maximum directional derivative of a function is given by the magnitude of the gradient vector. Then the maximum directional derivative of the function f(x, y) = x In y + x*y* at point (-1, 1) is given by A. -21 +j в. 15(-21+ ) с. 1 D. 5 E. 15

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