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In what direction is the derivative of f(x,y) = xy + y² at P(4,9) equal to zero?

User Encee
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To find the direction in which the derivative of f(x,y) = xy + y² at point P(4,9) is equal to zero, you can calculate the partial derivatives with respect to x and y and set them equal to zero.
User Artem Novichkov
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