Question

What’s the answer I need help pls?

Answer 1

(E). y = 2cos(3x)

Explanation:

First, amplitude of cos(x) is 1 , then 2cos(x) has amplitude 2

Second, period of cos(x) is 2
`\pi` , then 3 ×
`(2\pi )/(3)` = 2
`\pi`

So, the answer is y = 2cos(3x)