Textbook Question
Determine an equation for each graph.
Ch. 4 - Graphs of the Circular Functions
Lial12th EditionTrigonometryISBN: 9780136552161
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Table of contents
- Ch. R - Algebra Review381
- Ch. 1 - Trigonometric Functions188
- Ch. 2 - Acute Angles and Right Triangles168
- Ch. 3 - Radian Measure and The Unit Circle155
- Ch. 4 - Graphs of the Circular Functions100
- Ch. 5 - Trigonometric Identities238
- Ch. 6 - Inverse Circular Functions and Trigonometric Equations158
- Ch. 7 - Applications of Trigonometry and Vectors148
- Ch. 8 - Complex Numbers, Polar Equations, and Parametric Equations15
Chapter 5, Problem 4.39
Graph each function over a two-period interval. Give the period and amplitude. See Examples 2–5.
y = π sin πx
Verified step by step guidance1
Identify the standard form of the sine function: \( y = a \sin(bx + c) + d \). In this case, \( a = \pi \), \( b = \pi \), \( c = 0 \), and \( d = 0 \).
Determine the amplitude of the function. The amplitude is the absolute value of \( a \), which is \( |\pi| = \pi \).
Calculate the period of the function. The period is given by \( \frac{2\pi}{b} \). Substitute \( b = \pi \) to find the period: \( \frac{2\pi}{\pi} = 2 \).
Graph the function over a two-period interval. Since the period is 2, a two-period interval is from \( x = 0 \) to \( x = 4 \).
Plot key points of the sine function within the interval, considering the amplitude and period. The key points occur at \( x = 0, 1, 2, 3, 4 \) with corresponding \( y \)-values calculated using \( y = \pi \sin(\pi x) \).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Period of a Trigonometric Function
The period of a trigonometric function is the length of one complete cycle of the wave. For the sine function, the standard period is 2π. However, when the function is modified, such as in y = π sin(πx), the period can be calculated by dividing the standard period by the coefficient of x, which in this case is π. Thus, the period of this function is 2.
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Period of Sine and Cosine Functions
Amplitude of a Trigonometric Function
The amplitude of a trigonometric function refers to the maximum distance the function reaches from its midline. For the sine function, the amplitude is determined by the coefficient in front of the sine term. In the function y = π sin(πx), the amplitude is π, indicating that the graph will oscillate between π and -π.
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Graphing Trigonometric Functions
Graphing trigonometric functions involves plotting the values of the function over a specified interval. For y = π sin(πx), one would plot points for x values within a two-period interval, which is from 0 to 4. The graph will exhibit a wave-like pattern, reflecting the calculated period and amplitude, allowing for visual interpretation of the function's behavior.
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Related Practice
Textbook Question
Determine an equation of the form y = a cos bx or y = a sin bx, where b > 0, for the given graph. See Example 6.
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Textbook Question
Graph each function over the interval [-2π, 2π]. Give the amplitude. See Example 1.
y = 2 cos x
Textbook Question
Graph each function over a two-period interval. Give the period and amplitude. See Examples 2–5.
y = 2 sin ¼ x
Textbook Question
For each function, give the amplitude, period, vertical translation, and phase shift, as applicable.
y = 2 sin 2x
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Textbook Question
Determine an equation for each graph.