(a)
Whether the first order partial derivative of x at the point (4,1) is positive or negative from the given graph f.
(b)
Whether the first order partial derivative of y at the point (4,1) is positive or negative from the given graph f.
(c)
Whether the first order partial derivative of x at the point (4,3) is positive or negative from the given graph f.
(d)
Whether the first order partial derivative of y at the point (4,3) is positive or negative from the given graph f.
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