Lose the a! Otherwise, you're fine. I would look at graphs of the sinc function, like here. The a inside would have the effect of stretching the function out horizontally (or scrunching it in, depending on its size relative to 1).
Lose the a! Otherwise, you're fine. I would look at graphs of the sinc function, like here. The a inside would have the effect of stretching the function out horizontally (or scrunching it in, depending on its size relative to 1).