(a)
The first order partial derivative of x is positive or negativeat the point P from the given graph f.
(b)
The first order partial derivative of y is positive or negativeat the point P from the given graph f.
(c)
The second order partial derivative of x is positive or negativeat the point P from the given graph f.
(d)
The second order partial derivative of fxy is positive or negativeat the point P from the given graph f.
(e)
The second order partial derivative of y is positive or negative at the point P from the given graph f.
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