Calculating Limits without L'Hopital: A Scientist's Perspective

Thread starter xisco
Start date Oct 18, 2022
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l'hopital Limit

In summary, to calculate a limit without using L'Hopital's rule, you can use techniques such as factoring, rationalizing the numerator or denominator, or using trigonometric identities. This can be done when the limit is in an indeterminate form, such as 0/0 or ∞/∞. Knowing how to calculate limits without L'Hopital's rule is important as not all functions can be solved using this rule. However, there may be cases where it is not possible to solve a limit without using L'Hopital's rule. Additionally, there are limitations to using this method, such as when dealing with trigonometric or irrational functions, or more complex limits.

Oct 18, 2022

xisco

Misplaced Homework Thread

How can I calculate

preferably without L'Hopital? Thanks.

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Oct 18, 2022

BvU

Science Advisor

Homework Helper

Hello @xisco ,

##\qquad ## !

Well, what do you have in your toolbox to tackle this one ?

(PF guidelines require you post an attempt at solution before we are allowed to assist)

##\ ##

1. What is the concept of a limit without using L'Hopital's rule?

The concept of a limit without using L'Hopital's rule is to determine the value that a function approaches as the input approaches a particular value. This can be done by evaluating the function at values closer and closer to the input value and observing the trend of the output.

2. When can L'Hopital's rule not be used to evaluate a limit?

L'Hopital's rule cannot be used to evaluate a limit when the function is not in an indeterminate form, such as when the limit is a finite number or infinite. It also cannot be used when the limit involves trigonometric functions or exponential functions.

3. How do you solve a limit without using L'Hopital's rule?

To solve a limit without using L'Hopital's rule, you can use algebraic manipulation, factoring, or substitution to simplify the function into a form that can be evaluated directly. You can also use properties of limits, such as the sum, difference, product, and quotient rules, to simplify the function.

4. What are the advantages of solving a limit without using L'Hopital's rule?

Solving a limit without using L'Hopital's rule allows you to understand the behavior of a function and its limit in a more fundamental way. It also allows you to develop problem-solving skills and a deeper understanding of mathematical concepts.

5. Can a limit be evaluated without using L'Hopital's rule if the function is undefined at the input value?

Yes, a limit can still be evaluated without using L'Hopital's rule if the function is undefined at the input value. This can be done by evaluating the limit from both the left and right sides of the input value and determining if the left and right limits are equal. If they are equal, then the limit exists, but if they are not equal, then the limit does not exist.