00:03
Now here we are looking at basically two signals, right, at xt and yt, right? you also just sketch the signals x plus y and x minus y, right? and that's pretty easy to do, right? so let's look at this time t and basically look at one, and the second is two, right? and suppose this is one and this is two, right? and of course we look at this part as well.
00:30
This is minus one.
00:31
So very clearly, you look at the x plus y, right? you look at x plus y, and in the first second, they are the same, right? so you get actually two here.
00:43
But in the second to second, they are opposite.
00:45
So you get zero, right? so you could say this.
00:49
So that is giving you x plus y, right? and of course, you can also work out x minus y...