Ch. 3 - Derivatives

Briggs - Calculus: Early Transcendentals 3rd Edition

Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Not the one you use?Change textbook

Briggs 3rd Edition

Ch. 3 - Derivatives

Problem 3.10.17

Chapter 3, Problem 3.10.17

Evaluate the derivative of the following functions.
f(x) = sin^-1(e^-2x)

Verified step by step guidance

Step 1: Recognize that the function f(x) = \(\sin\)^{-1}(e^{-2x}) is an inverse trigonometric function composed with an exponential function. To find the derivative, we will use the chain rule.

Step 2: Recall the derivative of the inverse sine function: \( \frac{d}{dx} [\sin^{-1}(u)] = \frac{1}{\sqrt{1-u^2}} \cdot \frac{du}{dx} \). Here, u = e^{-2x}.

Step 3: Differentiate the inner function u = e^{-2x} with respect to x. The derivative of e^{-2x} is \( \frac{d}{dx}[e^{-2x}] = -2e^{-2x} \).

Step 4: Substitute the derivative of the inner function and the expression for u into the derivative formula for the inverse sine function: \( \frac{d}{dx} [\sin^{-1}(e^{-2x})] = \frac{1}{\sqrt{1-(e^{-2x})^2}} \cdot (-2e^{-2x}) \).

Step 5: Simplify the expression: The derivative is \( \frac{-2e^{-2x}}{\sqrt{1-e^{-4x}}} \).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Derivative

The derivative of a function measures how the function's output value changes as its input changes. It is defined as the limit of the average rate of change of the function over an interval as the interval approaches zero. In calculus, the derivative is often denoted as f'(x) or df/dx, and it provides critical information about the function's behavior, such as its slope and points of tangency.

Inverse Trigonometric Functions

Inverse trigonometric functions, such as sin-1(x), are the functions that reverse the action of the standard trigonometric functions. For example, sin-1(x) gives the angle whose sine is x. These functions have specific domains and ranges, and their derivatives can be derived using implicit differentiation or known derivative formulas, which are essential for evaluating derivatives involving these functions.

Chain Rule

The chain rule is a fundamental technique in calculus used to differentiate composite functions. It states that if a function y = f(g(x)) is composed of two functions, the derivative can be found by multiplying the derivative of the outer function f with the derivative of the inner function g. This rule is particularly useful when dealing with functions like f(x) = sin-1(e-2x), where the inner function e-2x must be differentiated alongside the outer inverse sine function.

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Related Practice

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Textbook Question

Find y'' for the following functions.

y = e^x sin x

Evaluate the derivative of the following functions.f(x) = sin-1 (e-2x)

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Key Concepts

Derivative

Inverse Trigonometric Functions

Chain Rule

Evaluate the derivative of the following functions.
f(x) = sin^-1(e^-2x)