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Ch. 3 - Derivatives
Hass - Thomas' Calculus 15th Edition
Hass15th EditionThomas' CalculusISBN: 9780137616077Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoHass 15th EditionCh. 3 - DerivativesProblema 107b
Capitolo 3, Problema 107b

Find the linearizations of


a. tan x at x = -π/4


Graph the curves and linearizations together.

Guida verificata passo dopo passo
1
To find the linearization of a function at a given point, we use the formula for the linear approximation: L(x) = f(a) + f'(a)(x - a), where f(x) is the function and a is the point of interest.
First, identify the function f(x) = tan(x) and the point a = -π/4.
Calculate f(a) by evaluating tan(-π/4). Recall that tan(-π/4) = -1.
Next, find the derivative of the function, f'(x) = sec^2(x). Evaluate this derivative at x = -π/4. Since sec(x) = 1/cos(x), and cos(-π/4) = √2/2, we have sec(-π/4) = 2/√2 = √2. Therefore, sec^2(-π/4) = 2.
Substitute f(a) and f'(a) into the linearization formula: L(x) = -1 + 2(x + π/4). This is the linear approximation of tan(x) at x = -π/4. To graph, plot both the curve y = tan(x) and the line y = L(x) on the same set of axes to visualize the approximation.

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Linearization

Linearization is the process of approximating a function near a given point using the tangent line at that point. The linearization of a function f(x) at x = a is given by L(x) = f(a) + f'(a)(x - a). This provides a simple linear model that approximates the function's behavior near x = a.
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Derivative of Trigonometric Functions

Understanding the derivative of trigonometric functions is crucial for linearization. For the function tan(x), the derivative is sec^2(x). This derivative is used to find the slope of the tangent line, which is essential for constructing the linear approximation at a specific point.
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Introduction to Trigonometric Functions

Graphing Functions and Linear Approximations

Graphing both the original function and its linear approximation helps visualize how well the linearization approximates the function near the point of tangency. It involves plotting the function, the tangent line, and observing their behavior around the point of interest, which in this case is x = -π/4.
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