Absolute Extrema of Trigonometric Functions on Closed Intervals

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In summary, the absolute maximum of a function is the highest value it reaches over its entire domain, while the absolute minimum is the lowest value it reaches. To find these values, the derivative of the function is taken and set equal to zero, and then the critical points are evaluated. The relative maximum/minimum refers to the highest/lowest value within a specific interval, while the absolute maximum/minimum refers to the highest/lowest value over the entire domain. A function can only have one absolute maximum and one absolute minimum. Finding the absolute maximum/minimum of a function can be useful in various real-world applications, such as optimizing processes, maximizing profits, and minimizing costs. It can also help in determining the maximum or minimum values of physical quantities
  • #1
joonpark89
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Homework Statement



Find the absolute max and absolute min values of function on the given interval:
f(t) = 2cos(t) + sin(2t), [0,pi/2]

Homework Equations





The Attempt at a Solution



f '(t) = 0
0 = -2sin(t) + 2cos(2t)
2sin(t) = 2cos(2t)
stuck...
 
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  • #2
Use a double angle formula to change the cosine term into a sine term. Then you'll have solvable equation.
 

1. What is the definition of absolute maximum/minimum?

The absolute maximum of a function is the highest value that the function reaches over its entire domain. Similarly, the absolute minimum is the lowest value that the function reaches over its entire domain.

2. How do you find the absolute maximum/minimum of a function?

To find the absolute maximum/minimum of a function, you need to take the derivative of the function and set it equal to zero. Then, solve for the critical points of the function and evaluate the function at these points to determine the absolute maximum/minimum.

3. What is the difference between relative maximum/minimum and absolute maximum/minimum?

The relative maximum/minimum of a function refers to the highest or lowest value of the function within a specific interval. The absolute maximum/minimum, on the other hand, refers to the highest or lowest value of the function over the entire domain.

4. Can a function have more than one absolute maximum/minimum?

No, a function can only have one absolute maximum and one absolute minimum. This is because the absolute maximum/minimum refers to the highest/lowest value of the function over its entire domain.

5. How can finding the absolute maximum/minimum of a function be useful in real-world applications?

Finding the absolute maximum/minimum of a function can be useful in many real-world applications, such as optimizing production processes, maximizing profits, and minimizing costs. It can also help in determining the maximum or minimum values of physical quantities, such as temperature or pressure, in a given system.

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