Math Help - Sinusoidal Functions

1. Sinusoidal Functions

Hi i need help with this problem my test is tomorrow and i am trying to figure out if i am right i have attached the file and the problem is number 13

i got y=-1+8cos pi/35(x-5)

thank you for your help!

2. Re: Sinusoidal Functions

Sounds fair to me.

3. yes you are absolutely correct

no kidding, I've worked it out.

$y = ({8})( {cos\frac{\pi(x-5)}{\35})} -1$