Ch. 4 - Graphs of the Circular Functions

Lial12th EditionTrigonometryISBN: 9780136552161, 9780135440780, 9780136881117, 9780135440827, 9780135924891Non è quello che usi tu?Cambia libro di testo

Lial 12th Edition

Ch. 4 - Graphs of the Circular Functions

Problema 27

Capitolo 5, Problema 27

Graph each function over a two-period interval.
y = cot (3x + π/4)

Guida verificata passo dopo passo

Identify the given function: \(y = \cot(3x + \frac{\pi}{4})\).

Recall that the cotangent function \(\cot(\theta)\) has a fundamental period of \(\pi\). For the function \(y = \cot(bx + c)\), the period is given by \(\frac{\pi}{|b|}\). Here, \(b = 3\), so the period is \(\frac{\pi}{3}\).

Since the problem asks to graph over a two-period interval, calculate the length of this interval as \(2 \times \frac{\pi}{3} = \frac{2\pi}{3}\).

Determine the starting and ending points of the interval. Because of the phase shift \(\frac{\pi}{4}\) inside the argument, solve for \(x\) when the argument goes from \(-\frac{\pi}{4}\) to \(-\frac{\pi}{4} + \frac{2\pi}{3}\) to cover two periods.

Plot key points within this interval by finding where the cotangent function has vertical asymptotes (where the argument equals multiples of \(\pi\)) and zeros (where the argument equals \(\frac{\pi}{2} + k\pi\)), then sketch the curve accordingly.

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Cotangent Function and Its Properties

The cotangent function, cot(x), is the reciprocal of the tangent function and is periodic with period π. It has vertical asymptotes where the sine function is zero, causing the function to be undefined. Understanding its shape, zeros, and asymptotes is essential for accurate graphing.

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Introduction to Cotangent Graph

Period of a Trigonometric Function with Horizontal Scaling

When the input of a trigonometric function is multiplied by a constant (e.g., 3x), the period changes. The new period is the original period divided by the absolute value of the coefficient. For cot(3x + π/4), the period is π/3, which affects the interval over which the function repeats.

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Period of Sine and Cosine Functions

Phase Shift in Trigonometric Functions

The phase shift is the horizontal translation of the graph caused by adding or subtracting a constant inside the function's argument. For cot(3x + π/4), the phase shift is found by solving 3x + π/4 = 0, resulting in a shift of -π/12. This shift moves the graph left or right along the x-axis.

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Phase Shifts

Pratica correlata

Domanda del libro di testo

Each function graphed is of the form y = c + cos x, y = c + sin x, y = cos(x - d), or y = sin(x - d), where d is the least possible positive value. Determine an equation of the graph.

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Domanda del libro di testo

Each function graphed is of the form y = c + cos x, y = c + sin x, y = cos(x - d), or y = sin(x - d), where d is the least possible positive value. Determine an equation of the graph.

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Domanda del libro di testo

Each function graphed is of the form y = c + cos x, y = c + sin x, y = cos(x - d), or y = sin(x - d), where d is the least possible positive value. Determine an equation of the graph.

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Graph each function over a two-period interval.

y = 1 + tan x

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Graph each function over a one-period interval.

y = -2 cos x

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