Textbook Question
Using identities Use the identity sin 2x=2 sin x cos x sin 2 to find d/dx (sin 2x). Then use the identity cos 2x = cos² x−sin² x to express the derivative of sin 2x in terms of cos 2x.
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Ch. 3 - Derivatives
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243
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Table of contents
- Ch. 1 - Functions210
- Ch. 2 - Limits371
- Ch. 3 - Derivatives633
- Ch. 4 - Applications of the Derivative412
- Ch. 5 - Integration328
- Ch. 6 - Applications of Integration331
- Ch. 7 - Logarithmic, Exponential Functions, and Hyperbolic Functions177
- Ch. 8 - Integration Techniques394
- Ch. 9 - Differential Equations179
- Ch. 10 - Sequences and Infinite Series339
- Ch. 11 - Power Series218
- Ch.12 - Parametric and Polar Curves215
Briggs3rd EditionCalculus: Early TranscendentalsISBN: 9780136847243Not the one you use?Change textbook
Chapter 3, Problem 3.9.46
15–48. Derivatives Find the derivative of the following functions.
y = 10^x(In 10^x-1)
Verified step by step guidance1
Identify the function for which you need to find the derivative: \( y = 10^x (\ln(10^x - 1)) \). This is a product of two functions, so you will use the product rule.
Recall the product rule for derivatives: If \( u(x) \) and \( v(x) \) are functions of \( x \), then the derivative of their product \( u(x)v(x) \) is \( u'(x)v(x) + u(x)v'(x) \).
Assign \( u(x) = 10^x \) and \( v(x) = \ln(10^x - 1) \). Find the derivative of \( u(x) \), which is \( u'(x) = 10^x \ln(10) \) because the derivative of \( 10^x \) is \( 10^x \ln(10) \).
Find the derivative of \( v(x) = \ln(10^x - 1) \). Use the chain rule: the derivative of \( \ln(g(x)) \) is \( \frac{1}{g(x)} \cdot g'(x) \). Here, \( g(x) = 10^x - 1 \), so \( g'(x) = 10^x \ln(10) \). Thus, \( v'(x) = \frac{10^x \ln(10)}{10^x - 1} \).
Apply the product rule: \( y' = u'(x)v(x) + u(x)v'(x) = 10^x \ln(10) \cdot \ln(10^x - 1) + 10^x \cdot \frac{10^x \ln(10)}{10^x - 1} \). Simplify this expression to find the derivative.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Derivatives
A derivative represents the rate of change of a function with respect to its variable. It is a fundamental concept in calculus that allows us to determine how a function behaves at any given point. The derivative can be interpreted as the slope of the tangent line to the curve of the function at a specific point.
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Derivatives
Exponential Functions
Exponential functions are mathematical functions of the form y = a^x, where 'a' is a constant and 'x' is the variable. In the context of the given function, 10^x is an exponential function, and its derivative can be found using the rule that states the derivative of a^x is a^x * ln(a). Understanding how to differentiate exponential functions is crucial for solving the problem.
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Product Rule
The product rule is a formula used to find the derivative of the product of two functions. It states that if u(x) and v(x) are two differentiable functions, then the derivative of their product is given by u'v + uv'. In the given function, the presence of the product of 10^x and (ln(10^x) - 1) necessitates the use of the product rule to find the derivative correctly.
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Related Practice
Textbook Question
Derivatives Find and simplify the derivative of the following functions.
f(x) = x /x+1
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Textbook Question
A projectile is fired vertically upward into the air; its position (in feet) above the ground after t seconds is given by the function s (t). For the following functions, use limits to determine the instantaneous velocity of the projectile at t = a seconds for the given value of a.
s(t) = -16t2 + 128t + 192; a = 2
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Textbook Question
Derivatives Find and simplify the derivative of the following functions.
f(t) = t⁵/³e^t
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Textbook Question
Find y'' for the following functions.
y = ex sin x
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Textbook Question
Calculate the derivative of the following functions. In some cases, it is useful to use the properties of logarithms to simplify the functions before computing f'(x).
y = 4 log₃(x²−1)
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