Question: Use a graph or level curves or both to estimate the local maximum and minimum values and saddle point(s) of the function. Then use calculus

Use a graph or level curves or both to estimate the local maximum and minimum values and saddle point(s) of the function. Then use calculus to find these values precisely.

f(x, y) = sin x + sin y + cos(x + y), 0 < x< T/4, 0 < y< T/4

f(x, y) = sin x + sin y + cos(x + y), 0 < x < T/4, 0 < y < T/4

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