L'Hopital'S

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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L'Hopital'S ruledoesn'tapply with the given limit findthe limit some other way.
### Understanding Limits in Trigonometric Functions

In this example, we are calculating the limit of a trigonometric expression as the variable \(\theta\) approaches \(\frac{\pi}{2}\) from the left.

\[ \lim_{\theta \to \frac{\pi}{2}^{-}} \frac{\csc \theta}{\cot \theta} \]

Let's break down the components of this limit:

1. **\(\csc \theta\)**: The cosecant function, which is the reciprocal of the sine function.
   \[
   \csc \theta = \frac{1}{\sin \theta}
   \]

2. **\(\cot \theta\)**: The cotangent function, which is the reciprocal of the tangent function.
   \[
   \cot \theta = \frac{\cos \theta}{\sin \theta}
   \]

Thus, the expression inside the limit becomes:

\[ \frac{\csc \theta}{\cot \theta} = \frac{\frac{1}{\sin \theta}}{\frac{\cos \theta}{\sin \theta}} = \frac{1}{\cos \theta} \]

As \(\theta\) approaches \(\frac{\pi}{2}\) from the left, \(\cos \theta\) approaches 0. Therefore:

\[ \frac{1}{\cos \theta} \]

becomes very large, meaning it approaches infinity.

Thus,

\[ \lim_{\theta \to \frac{\pi}{2}^{-}} \frac{\csc \theta}{\cot \theta} = \infty \]

This example illustrates an important concept in calculus regarding the behavior of trigonometric functions as they approach key angles.
Transcribed Image Text:### Understanding Limits in Trigonometric Functions In this example, we are calculating the limit of a trigonometric expression as the variable \(\theta\) approaches \(\frac{\pi}{2}\) from the left. \[ \lim_{\theta \to \frac{\pi}{2}^{-}} \frac{\csc \theta}{\cot \theta} \] Let's break down the components of this limit: 1. **\(\csc \theta\)**: The cosecant function, which is the reciprocal of the sine function. \[ \csc \theta = \frac{1}{\sin \theta} \] 2. **\(\cot \theta\)**: The cotangent function, which is the reciprocal of the tangent function. \[ \cot \theta = \frac{\cos \theta}{\sin \theta} \] Thus, the expression inside the limit becomes: \[ \frac{\csc \theta}{\cot \theta} = \frac{\frac{1}{\sin \theta}}{\frac{\cos \theta}{\sin \theta}} = \frac{1}{\cos \theta} \] As \(\theta\) approaches \(\frac{\pi}{2}\) from the left, \(\cos \theta\) approaches 0. Therefore: \[ \frac{1}{\cos \theta} \] becomes very large, meaning it approaches infinity. Thus, \[ \lim_{\theta \to \frac{\pi}{2}^{-}} \frac{\csc \theta}{\cot \theta} = \infty \] This example illustrates an important concept in calculus regarding the behavior of trigonometric functions as they approach key angles.
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