00:01
Want us to choose the letter of the correct equation for the graph.
00:04
So what i notice here is it can be either sine or cosine adjusted, but they give us a choice.
00:12
So we're having here that i'm just going to draw this side right here.
00:16
Okay, there we have that, and then it continues on here.
00:22
So what i'm going to do is i'm just going to go get what sign would normally look like in that region.
00:28
So sign, this is what sign would normally look like in that region.
00:34
And then here's what cosine would normally look like in that region.
00:44
Now i didn't draw the whole thing.
00:48
So we've got to think we're shifting one of them either left or right.
00:52
So if i look at my choice is cosine of x plus pi.
00:55
That means we would take this blue graph and we would shift it left pi units.
01:01
Well that's going to be too much.
01:03
So then we're going to see cosine of pi x minus pi over two.
01:08
So that means that we would take this cosine graph, the blue one, and we would shift it right pi over two...