Question

I NEED HELP PLEASE! THANKS :)

Answer 1

`y = 2 \: cos \: ((1)/(3) x)`

option C is the right option.

Explanation:

General expression of a cosine function is:

y=A cos k X

where A is amplitude and 2 pi/k is its period.

In our case,

`- y = 2 \: cos \: ((1)/(3) x) \:`

has :

`amplitude = 2 \\ period = 2\pi * 3 = 6\pi`

hence, the right answer is of option C

hope this helps...

Good luck on your assignment..