If the critical point of the function f(x, y)- x - y - 2xy + 6 is (0,0), test this point whether it is: a) Local maximum b) Local minimum c) Saddle point d) Inconclusive test e) None of them b d O e f O g O If z' = y sin(xy), find at the point (-1, .1) b)플+1 d) --1 a) - 0.5 c) - 2 e) 0 g) None of them II

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