Exploring Limits and Boundedness in Trigonometric Functions

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In summary, a limits problem is a mathematical concept where the value of a function or sequence approaches a certain value as the input or index approaches a specific value. It is important in mathematics and science as it helps us understand the behavior and properties of functions and sequences, and can be applied in fields such as physics, engineering, and economics. To solve a limits problem, one needs to determine the limit expression and use algebraic and/or graphical techniques. The common types of limits problems include finding the limit of a function at a specific point, evaluating one-sided limits, and determining the existence of a limit using the squeeze theorem. Limits problems also have practical applications in fields such as population growth prediction, optimization, and computer science.
  • #1
jason_r
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Show x<(or equal) xsin(1/x) <(or equal) -x if x<0

and -|x| <(or equal) xsin(1/x) <(or equal) |x| if x can't be 0
 
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  • #2
Well, we know that sine and cosine are bounded right?

so [tex] |sin(a)|\leq 1[/tex] which means that

[tex] -1\leq sina \leq 1[/tex] now in your first part replace a by 1/x than multiply both sides by x, since x is smaller than zero, your inequality sides switch. procede similarly in 2.
 

FAQ: Exploring Limits and Boundedness in Trigonometric Functions

What is a limits problem?

A limits problem refers to a mathematical concept where the value of a function or sequence approaches a certain value as the input or index approaches a specific value. It is used to determine the behavior of a function or sequence near a certain point.

Why are limits problems important?

Limits problems are important in mathematics and science because they allow us to understand the behavior and properties of functions and sequences. They are also used to solve real-world problems in fields such as physics, engineering, and economics.

How do you solve a limits problem?

To solve a limits problem, you need to first determine the limit expression and then use algebraic and/or graphical methods to evaluate the limit. This can include techniques such as factoring, rationalizing, or using L'Hôpital's rule.

What are the common types of limits problems?

The common types of limits problems include finding the limit of a function at a specific point, evaluating one-sided limits, and determining the existence of a limit using the squeeze theorem. Additionally, limits can also involve infinite limits and limits of sequences.

How can limits problems be applied in real life?

Limits problems have various applications in real life, such as predicting population growth, determining the maximum and minimum values of a function, and finding the best possible solution to a problem. They are also used in fields such as computer science, finance, and statistics.

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