Question
Write a cosine function that has a midline of y=4 an amplitude of 2, a period of 4pi , and a horizontal shift of 2pi to the left. Answer Attemptiout of 2 f(x)=
Solution
4.2
(300 Votos)
Antônio
Profissional · Tutor por 6 anos
Resposta
The cosine function that satisfies the given conditions is \(f(x) = 2 \cos\left(\frac{1}{2}(x + 2\pi)\right) + 4\).
Explicação
## Step 1The general form of a cosine function is given by:### \(f(x) = A \cos(B(x - C)) + D\)where:-
is the amplitude of the function,-
is the frequency of the function,-
is the horizontal shift of the function, and-
is the midline of the function.## Step 2In this problem, we are given that the amplitude
, the midline
, the period
, and the horizontal shift
.## Step 3The frequency
is related to the period
by the formula:###
Substituting the given period
into the formula, we get:###
## Step 4Substituting the values of
,
,
, and
into the general form of the cosine function, we get:### \(f(x) = 2 \cos\left(\frac{1}{2}(x + 2\pi)\right) + 4\)