00:01
Okay, so i want to write a sign or cosine function.
00:05
I've just picked off a piece of the graph that i think makes it easy to see.
00:10
So i'm going to use a cosine function.
00:19
I'll just put a t here.
00:20
It could be any letter.
00:21
Actually, let's make it a c.
00:22
Let's be consistent.
00:24
So what are these letters? what do i need for my function? well, a is my amplitude.
00:32
B is my frequency.
00:35
And c is my vertical shift.
00:39
Okay, so let's take this apart.
00:42
First thing i notice is my low point on my graph is at negative 6.
00:48
My high point on my graph is at positive 2.
00:52
So between those two values, there are eight units.
00:57
And i know that this graph has a midline.
00:59
This graph has a line that kind of splits the graph into equal parts above and below.
01:05
So that's going to be halfway between 2 and negative 6.
01:09
So that's going to be four units from either of them.
01:13
That's going to put me right here at negative 2.
01:17
I'd be like, well, why do i want that? a couple things.
01:20
It's your vertical shift.
01:22
Okay, so i know my vertical shift is going to be down to.
01:26
Right? i can add that in at the end here...