# Thread: Problem involving period of a sinusoid func.

1. ## Problem involving period of a sinusoid func.

"For which value of k does y=cos(k)(x) have a period of 2?"

I'm sure this is a relatively stupid question, I just need a clarification on this concept here..

So if someone could explain this to me, I'd appreciate it. Thanks.

2. Originally Posted by Savior_Self
"For which value of k does y=cos(k)(x) have a period of 2?"

I'm sure this is a relatively stupid question, I just need a clarification on this concept here..

So if someone could explain this to me, I'd appreciate it. Thanks.
$y = \cos(kx)$

period , $T = \frac{2\pi}{k}$