For the function:   z=cos^3(x)cos^3(y) a. Find and classify all of its critical points. b. Tell how to use the contour map of the surface to show the critical points and the behavior of the level curves near those points. Use this information to explain the contour map of the selected surface.

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A: Let's find.

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A: Below is the solution:-

Q: Find

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A: you can clearly understand if you follow the below solution

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