Question: Please solve correctly with proper explanations 4. Locate all relative maxima, relative minima and saddle points, if any 2 A f (x, y) = xy

Please solve correctly with proper explanations

4. Locate all relative maxima, relative minima and saddle points, if any 2 A f (x, y) = xy + + 5. Find the area of the triangle having vertices at P(1, 2, 3), Q(2, -1, 1), R(-1, 2, 3). Hint:use cross product of two vectors
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