Math Problem Statement

find the limit

Find the limit: lim(x -> pi) (sin(x) / (pi - x))

Solution

It seems that the extraction from the image was not successful. However, I can clearly see the expression from the image. The problem is to find:

limxπsinxπx\lim_{{x \to \pi}} \frac{{\sin x}}{{\pi - x}}

Let's solve this limit.

Step-by-Step Solution:

This limit is in the indeterminate form 00\frac{0}{0} as xπx \to \pi because:

  • sin(π)=0\sin(\pi) = 0
  • ππ=0\pi - \pi = 0

We can apply L'Hopital's Rule, which is used for limits of the form 00\frac{0}{0} or \frac{\infty}{\infty}. According to L'Hopital's Rule:

limxcf(x)g(x)=limxcf(x)g(x)\lim_{{x \to c}} \frac{{f(x)}}{{g(x)}} = \lim_{{x \to c}} \frac{{f'(x)}}{{g'(x)}}

if the limit exists. Here, we have:

  • f(x)=sin(x)f(x) = \sin(x), so f(x)=cos(x)f'(x) = \cos(x)
  • g(x)=πxg(x) = \pi - x, so g(x)=1g'(x) = -1

Now applying L'Hopital's Rule:

limxπsin(x)πx=limxπcos(x)1\lim_{{x \to \pi}} \frac{{\sin(x)}}{{\pi - x}} = \lim_{{x \to \pi}} \frac{{\cos(x)}}{{-1}}

Since cos(π)=1\cos(\pi) = -1, we get:

limxπcos(x)1=11=1\lim_{{x \to \pi}} \frac{{\cos(x)}}{{-1}} = \frac{{-1}}{{-1}} = 1

Thus, the value of the limit is:

1\boxed{1}

Would you like more details on any part of this solution? Here are five related questions:

  1. What is L'Hopital's Rule, and when can it be applied?
  2. How do you differentiate trigonometric functions like sin(x)\sin(x) and cos(x)\cos(x)?
  3. Can this problem be solved using a series expansion of sin(x)\sin(x)?
  4. What happens if you attempt this limit without L'Hopital's Rule?
  5. Are there other indeterminate forms besides 00\frac{0}{0}?

Tip:

Always check for indeterminate forms like 00\frac{0}{0} or \frac{\infty}{\infty} before applying L'Hopital's Rule, as it can greatly simplify evaluating limits.

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Math Problem Analysis

Mathematical Concepts

Limits
Trigonometry
L'Hopital's Rule

Formulas

lim(x -> c) (f(x) / g(x)) = lim(x -> c) (f'(x) / g'(x))

Theorems

L'Hopital's Rule

Suitable Grade Level

Grades 11-12 (Pre-Calculus/Calculus)