00:01
In this problem, you are first asked to plot the point that's given to you 4 pi over 3, and that is in terms of r and theta.
00:17
So the first thing we're going to do is locate the angle, which is 4 pi over 3, and then from the center count out to the fourth ring for the radius.
00:30
So that point would be at that location.
00:34
All right, then the next thing you're asked to do is change to cartesian coordinates.
00:40
That means that you want to find the x value and the y value.
00:44
All right, so we're going to use the unit circle values, and at 4 pi over 3, we're going to be using the x value for cosine and the y value for sign.
00:59
All right, so let's go ahead and get the x value.
01:03
X is equal to the formula says r cosine theta, where r is 4, and cosine of 4 pi over 3...