00:01
Okay, we're going to do a few proofs here.
00:04
So the first thing we're going to prove is that the inverse sign of negative x equals the negative of the inverse sign of x.
00:14
So when you do a proof, what you do is you want to start with one of them and you want to manipulate it until you get to the other.
00:21
So we're going to start with the idea of that sign negative 1 of the negative x.
00:28
So we'll set y equal to that so that we can work.
00:31
With both sides.
00:33
Because the first thing we want to do is undo our inverse sign.
00:37
So we're actually going to take the sign of both sides.
00:40
When we do that, we get sign of y equals negative x.
00:45
Now we're going to go ahead and consider that sign is what you call a odd function.
00:57
And an odd function, you can say that if you put a negative value into that function, you should receive out the negative value of your y component...