00:01
Okay, and your question you were asked to find the domain of both the sign and cosine functions and the range.
00:07
You're supposed to type your answers in interval notation, type exact answers using pi as neat.
00:15
What i've done down here is i've shown the graphs of the sign and cosine functions.
00:20
And the domain is x values.
00:27
Domain is x values or the x axis.
00:30
And what we can see here with our graphs, both of them, is that there are no asmatotes in it.
00:39
There are no places where the graph is undefined.
00:42
This would just keep following that pattern.
00:44
That's why i have arrows on the end.
00:45
It would just keep on this wave forever and ever in both directions.
00:50
So your domain for both of these graphs in interval notation would be negative infinity to infinity.
00:58
There are no x values that we can't take a sign value of.
01:04
Now, as far as range, range has to do with y values.
01:11
So i'm going to say range is y values...