Struggling with this limit value.(probably using taylor series)

In summary, the conversation is about finding the limit of a function involving a Maclaurin series and a logarithm. Jarfi is struggling with the calculations and asks for a simple solution. Another user suggests taking the logarithm first.
  • #1
Jarfi
384
12
Struggling with this limit value

Homework Statement



Calculate lim((e^x-1)/x)^(1/sin(x)) where x[itex]\rightarrow0[/itex]

Homework Equations



Maclaurin series.

sin(x)/x -----> 1 when x->0 (possibly)

The Attempt at a Solution



(e^x-1)/x)^(1/sin(x) = ((x+x^2/2+x^3H(x))/x)^(1/sin(x)) =((1+x/2+x^2H(x))/x)^(1/sin(x))

Then getting something like:

1+(1/sinx)C(1)*(1+x/2+x^2H(x))/x) + (1+x/2+x^2H(x))/x)^2*(1/sinx)C(2)

which results in total chaos.

Anybody have a SIMPLE solution?

p.s sorry for the lack of readability, writing math in Physicsforums is a F-ing pain. I mean what the H is [it0ex]\rightharp0oonup[/it0ex] and [itex0]\frac{}{0}[/itex0] telling me.
 
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  • #2
Hi Jarfi! :smile:
Jarfi said:
Calculate lim((e^x-1)/x)^(1/sin(x)) where x[itex]\rightarrow0[/itex]

log it first? :wink:
 
  • #3
tiny-tim said:
Hi Jarfi! :smile:


log it first? :wink:

ah, you genius you !
 

1. What is a limit value?

A limit value is the value that a function approaches as its input approaches a certain number or point. It is an important concept in calculus and is used to determine the behavior of a function around a particular point.

2. What is a Taylor series?

A Taylor series is a representation of a function as an infinite sum of terms, where each term is a polynomial. It is useful for approximating the value of a function at a particular point or for finding the behavior of a function around that point.

3. How can I use a Taylor series to evaluate a limit value?

A Taylor series can be used to evaluate a limit value by plugging in the limit value for the variable in the series. The more terms that are included in the series, the more accurate the approximation of the limit value will be.

4. What are some common applications of using a Taylor series to evaluate limit values?

Taylor series are commonly used in physics, engineering, and other fields to approximate the behavior of a function around a particular point. They are also used in computer algorithms to estimate values and in statistics to analyze data.

5. Can a Taylor series always be used to evaluate a limit value?

No, a Taylor series can only be used to evaluate a limit value if the function is differentiable (meaning it has a well-defined derivative) at the point being evaluated. If the function is not differentiable at that point, then the Taylor series will not be accurate.

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