# Math Help - Complex

1. ## Complex

ImageShack - Hosting :: 1dfjpgzz9.jpg

Could someone please explain this to me?

2. ImageShack - Hosting :: igjisdep1.jpg

This one too if possible. Thanks

3. Originally Posted by hammer
ImageShack - Hosting :: 1dfjpgzz9.jpg

Could someone please explain this to me?
That's going to be tough to do as there is no explanation of what the x(n) are.

However, I will note that
$sin(x) = \frac{e^{ix} - e^{-ix}}{2i}$
and
$cos(x) = \frac{e^{ix} + e^{-ix}}{2}$

-Dan

4. Originally Posted by hammer
ImageShack - Hosting :: igjisdep1.jpg

This one too if possible. Thanks
There's too little information here. If you want help you are going to have to explain where this one comes from.

-Dan

5. sorry, the original question for the second one i posted reads:

Determine the magnitude and phase response of the following systems:

y(n) = 1/2 (x(n) - x(n-1))

I realize this involves plots, but I was jsut wondering how they minimized
H(w) the way they did