Use a graph or level curves or both to find the local maximum and minimum values and saddle points of the function. Then use calculus to find these values precisely. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) f(x, y) = sin(x) + sin(y) + sin(x + y) + 7, 0≤x≤ 2π, 0≤ y ≤ 2π local maximum value(s) local minimum value(s) saddle point(s) (x, y, f) =

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A: In this question we will use basic of calculus i.e concept of absolute extrema. We will use the…

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A: Okay I am solving. Type very carefully dear student.