Question

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

Answer 1

Welcome to the concept of Trignometry

Explanation:

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)