y = - In cos x y = e*tan x

Calculus: Early Transcendentals
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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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Differentiate.

a. y = -In cos x

b. y = e^xtanx

 

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The image contains two mathematical equations. These equations are fundamental in the study of calculus and transcendental functions. Here they are transcribed for clarity:

1. \( y = - \ln (\cos x) \)
2. \( y = e^{x \tan x} \)

### Explanation:

**1. \( y = - \ln (\cos x) \)**

- **Function Type:** Logarithmic
- **Natural Logarithm (ln):** The logarithm to the base \(e\), where \(e \approx 2.71828\).
- **Domain:** The function \(\cos x\) must be greater than 0 for the natural logarithm to be defined, thus \( x \) must be within the intervals where the cosine function is positive (excluding \(\pi/2 + k\pi\), where k is an integer).
- **Range:** The range of \(\cos x\) is \([0, 1]\) for \(x\) in the interval required by the function. Consequently, the range of the natural logarithm of \(\cos x\) will be \((-\infty, 0]\) which upon negation becomes \([0, \infty)\).

**2. \( y = e^{x \tan x} \)**

- **Function Type:** Exponential
- **Exponential Function (\(e^x\))**: The function \(e\) raised to the power of \(x\).
- **Domain:** For the function \(x \tan x\) to be defined, \(x\) should not be \(\pm \pi/2, \pm 3\pi/2, \ldots\) (where \(\tan x\) is undefined).
- **Range:** The range of \(x \tan x\) is all real numbers, and since the exponential function \(e^x\) is positive for all real numbers, the range of \(e^{x \tan x}\) will be \((0, \infty)\).

### Graphical Representation:

A detailed graph or diagram would depict:

- **\( y = - \ln (\cos x) \)**: This graph would show a periodic nature as it oscillates between intervals where \(\cos x\) is positive.
- **\( y = e^{x \tan x} \)**: This graph would depict the exponential growth
Transcribed Image Text:The image contains two mathematical equations. These equations are fundamental in the study of calculus and transcendental functions. Here they are transcribed for clarity: 1. \( y = - \ln (\cos x) \) 2. \( y = e^{x \tan x} \) ### Explanation: **1. \( y = - \ln (\cos x) \)** - **Function Type:** Logarithmic - **Natural Logarithm (ln):** The logarithm to the base \(e\), where \(e \approx 2.71828\). - **Domain:** The function \(\cos x\) must be greater than 0 for the natural logarithm to be defined, thus \( x \) must be within the intervals where the cosine function is positive (excluding \(\pi/2 + k\pi\), where k is an integer). - **Range:** The range of \(\cos x\) is \([0, 1]\) for \(x\) in the interval required by the function. Consequently, the range of the natural logarithm of \(\cos x\) will be \((-\infty, 0]\) which upon negation becomes \([0, \infty)\). **2. \( y = e^{x \tan x} \)** - **Function Type:** Exponential - **Exponential Function (\(e^x\))**: The function \(e\) raised to the power of \(x\). - **Domain:** For the function \(x \tan x\) to be defined, \(x\) should not be \(\pm \pi/2, \pm 3\pi/2, \ldots\) (where \(\tan x\) is undefined). - **Range:** The range of \(x \tan x\) is all real numbers, and since the exponential function \(e^x\) is positive for all real numbers, the range of \(e^{x \tan x}\) will be \((0, \infty)\). ### Graphical Representation: A detailed graph or diagram would depict: - **\( y = - \ln (\cos x) \)**: This graph would show a periodic nature as it oscillates between intervals where \(\cos x\) is positive. - **\( y = e^{x \tan x} \)**: This graph would depict the exponential growth
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