Question: f ( x , y ) = s i n ( x ) + s i n ( y ) + c o s (

f(x,y)=sin(x)+sin(y)+cos(x+y)+7,0x4,0y4
local maximum value(s)
local minimum value(s)
saddle point(s)
(x,y,f)=
f ( x , y ) = s i n ( x ) + s i n ( y ) + c o s (

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