# Algebra 2

Which cosine function has maximum of 4, a minimum of -4, and a period of 2pi/3?

A. y=4 cos 3 theta
B. y= 4 cos 2 theta/3
C. y=4 cos theta/3
D. y=4 cos 3 theta

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2. 👎 0
3. 👁 127
asked by Caleb
1. Write the equation as
y=a cos(b(θ))+k

For a max=4,and min=-4, k=0, and a=4, so
y=4cos(b(θ)))

Period = 2π/b
if period = 2π/3, then b=3, and the equation reads:
y=4cos(3θ)

Pick your choice betwen A and D, unless there is a typo.

1. 👍 0
2. 👎 0

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