00:01
So here we're asked to evaluate the function gx of y.
00:07
So gx of y.
00:13
And this function is defined as the cosine of x plus 2y.
00:26
All right.
00:27
So now that we have the function out of the way, the first thing that we're going to do is evaluate it at the point 2 -9 -1.
00:34
And that's as easy as just plugging them in and solving.
00:39
So if it's 2 negative 1, then that would be the cosine of x equals 2, y equals negative 1.
00:48
So it would be minus 2.
00:50
So cosine of 0 is equal to 1.
00:58
Okay, so the next thing we can do is calculate the domain and range of the function.
01:05
So first, starting with the domain, so for what values of x and y is the function defined? so i like to look at it graphically...