Question: find the local max and min values and saddle points of thefunctions step by step please f(x,y)=x^(2)+xy+y^(2)+y f(x,y)=(x-y)(1-xy) Also show the second derivative test please

find the local max and min values and saddle points of thefunctions step by step please

f(x,y)=x^(2)+xy+y^(2)+y

f(x,y)=(x-y)(1-xy)

Also show the second derivative test please in detail!

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