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- Find fx(−1,−1)if f(x,y)=2xy/1+x2y2. fx(−1,−1)= (Type an integer or a simplified fraction.)If (5,2) is a critical point for the function y= f(x) and f''(x) is + , what can we conclude regarding the point (5,2)?The function f(x)=2x^3−33x^2+108x-4 has two critical numbers. The smaller one is x =? and the larger one is x =?