00:01
Here, we're given three functions and we're asked to identify which one is the function, the derivative of that function, and which one is the second derivative.
00:10
Now, what i would recommend here is start with the second derivative, because it's going to be the one whose derivative is not shown.
00:17
So if we take a random graph, it doesn't really matter which one, and find where it's flat.
00:23
So say the green one is flat right here.
00:26
Is there a function that's always zero when it's flat? and there is.
00:30
So it looks like to me that the derivative of the green one is the red one.
00:35
So then let's eliminate the green one as the second derivative.
00:40
So now let's consider the red one.
00:42
Could the red one be the second derivative? well, if i look at the red one, where is it flat? is there a function that's zero? and there is every time it's flat.
00:52
The blue one is zero...