00:01
Okay, so remember that sign functions look like this.
00:09
So their domain, which is all inputs, is really anything, right? because this continues in both directions forever.
00:23
So you can put anything in.
00:26
That's how we write anything.
00:27
All real numbers or negative infinity to infinity.
00:31
The range, in this case, remember that the output of trigonometric functions is always between negative 1 and 1.
00:41
So at the minimum, it's minus 1, and at the maximum it's 1.
00:45
So the range would be close bracket, minus 1, 1.
00:50
For cosine, they look something like this, and it's not to scale, but it's just a sketch.
00:59
And it's very similar.
01:01
The domain, which is anything we can input, this is for cosine of x, the domain would be the same thing.
01:10
Can input anything we want...