Max/Min of a function using Lagrange Multipliers

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SUMMARY

The discussion focuses on finding the absolute maximum and minimum values of the function f(x,y) = sin x + cos y on the rectangle R defined by the constraints 0 ≤ x ≤ 2π and 0 ≤ y ≤ 2π using the method of Lagrange Multipliers. Participants emphasize the need to express the constraint in a manageable form, suggesting the use of x + y = C, where C is a constant. However, confusion arises regarding how this constraint effectively limits the function within the specified bounds of the rectangle.

PREREQUISITES
  • Understanding of Lagrange Multipliers
  • Knowledge of trigonometric functions (sin and cos)
  • Familiarity with the concept of constraints in optimization
  • Basic calculus, particularly partial derivatives
NEXT STEPS
  • Study the application of Lagrange Multipliers in constrained optimization problems
  • Explore the properties of trigonometric functions within specified intervals
  • Learn how to set up and solve optimization problems with multiple variables
  • Investigate graphical methods for visualizing constraints and objective functions
USEFUL FOR

Students in calculus courses, mathematicians interested in optimization techniques, and educators teaching methods of constrained optimization.

andrewjohnsc
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Homework Statement


Find the absolute maximum and minimum values for f(x,y) = sin x + cos y on the rectangle R defined by 0<=x<=2pi and 0<=y<=2pi using the method of Lagrange Multipliers.



The Attempt at a Solution


I don't know where to start in getting the constraint into something I can work with! :confused:
 
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you can always use x+y=C where C is some constant.
 
I don't understand how that constrains the function to 0<=x<=2pi 0<=y<=2pi
 

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