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alina1380 [7]
3 years ago
7

If the instructions for a problem ask you to use the smallest possible domain to completely graph two periods of y = 5 + 3 cos 2

(x -pi/3), what should be used for Xmin and Xmax? Explain your answer.
Mathematics
2 answers:
Finger [1]3 years ago
5 0
The period of a sinusoid \cos 2(x-c) is \dfrac{2\pi}2=\pi, so any range such that \mathrm{Xmax}-\mathrm{Xmin}=2\pi will give two complete periods.
Fantom [35]3 years ago
5 0

Answer:

The smallest possible domain to completely graph two periods is either [0, 2π] or [-π, π].

Step-by-step explanation:

The period of cosine function [0, 2π].

The given function is

y=5+3\cos 2(x-\frac{\pi}{3})

This function can be written as

y=5+3\cos (2x-\frac{2\pi}{3})          .... (1)

The general form of cosine function is

y=A\cos (Bx+C)+D              .... (2)

where, A is amplitude, \frac{2\pi}{B}, C is phase and D is midline.

From (1) and (2), we get

A=3,B=2C=\frac{2\pi}{3},D=5

Period=\frac{2\pi}{2}=\pi

The period of given function is [0,π]. So, the smallest possible domain to completely graph two periods is either [0, 2π] or [-π, π].

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