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In Exercises 9-18, determine the period and phase shift (if there is one) for each function. $$ y=\csc \left[3\left(x-\frac{\pi}{6}\right)\right] $$

Short Answer

Expert verified
Period = \( \frac{2\pi}{3} \), Phase Shift = \( \frac{\pi}{6} \) right.

Step by step solution

01

Identify the function type and basic period

The given function is \[ y = \csc(3(x-\frac{\pi}{6})) \].The \( \csc \, x \) function is related to \( \sin \, x \) such that its basic period is the same as \( \sin \, x \), which is \( 2\pi \).
02

Calculate the new period

For trigonometric functions of the form \( \csc(bx) \), the period is determined by \( \frac{2\pi}{b} \) instead of \( 2\pi \). In this case, \( b = 3 \). Therefore, the period is:\[\frac{2\pi}{3}.\]
03

Determine the phase shift

The expression inside the function is \( 3(x-\frac{\pi}{6}) \). The phase shift is determined from the expression \( bx-c \), where \( c \) is the inside constant. Solving for zero by setting this term to zero, \( 3(x-\frac{\pi}{6}) = 0 \), gives \( x = \frac{\pi}{6} \). Thus, the phase shift is \( \frac{\pi}{6} \) units to the right.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Cosecant function
The cosecant function, denoted as \( \csc(x) \), is one of the six fundamental trigonometric functions. It is the reciprocal of the sine function: \( \csc(x) = \frac{1}{\sin(x)} \). This means that wherever the sine function is zero, the cosecant function is undefined because division by zero is not possible.

The main characteristic of the \( \csc(x) \) function is its unique shape and properties. Since it is undefined at values where the sine function equals zero, it has vertical asymptotes at multiples of \( \pi \), specifically at \( x = n\pi \) where \( n \) is an integer. In between these vertical asymptotes, the graph of the cosecant function has a series of arcs that take shape either in an upward or downward curve.

The basic period of the \( \csc(x) \) is \( 2\pi \), similar to the sine function. This means the pattern of the function repeats itself every \( 2\pi \) units. Its distinctive shape and its vertical asymptotes make it an interesting function to study in relation to its foundational sine counterpart.
Period of trigonometric functions
The period of a trigonometric function refers to the interval after which the function's pattern repeats itself. For a regular function like sine or cosine, this period is \( 2\pi \). The period is a crucial aspect because it helps us understand how often the waves of the function repeat over a set interval.

When dealing with functions such as \( \csc(bx) \), the period is affected by the coefficient \( b \) inside the function. The formula to calculate the period for such functions is \( \frac{2\pi}{b} \). This means multiplying the function's variable \( x \) by a number (in our case \( b = 3 \)) compresses the graph and makes it repeat its pattern more frequently. Therefore, for \( \csc(3x) \), the period would be \( \frac{2\pi}{3} \), meaning the function's shape repeats every \( \frac{2\pi}{3} \) units.
Phase shift in trigonometry
A phase shift in trigonometry occurs when the entire graph of a trigonometric function is shifted horizontally. This horizontal shift is determined by changes inside the function's argument, typically written in the form \( bx - c \). Understanding how phase shifts work helps in accurately plotting and interpreting trigonometric functions.

For our exercise, we have \( 3(x-\frac{\pi}{6}) \). Here, to find the phase shift, we need to consider when the inside of the function equals zero: setting \( 3(x-\frac{\pi}{6}) = 0 \). Solving this equation for \( x \), we find \( x = \frac{\pi}{6} \), indicating a rightward shift by \( \frac{\pi}{6} \) units. This means that the starting point of the function cycle is moved right by this amount, maintaining the same shape but starting in a different position along the x-axis.

Keep in mind, positive constants inside the argument create leftward shifts, while negative constants result in rightward shifts, which is opposite to what might be expected.

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