00:01
We want to find the rectangular coordinate equation from this polar coordinate equation.
00:06
Before we do that, let's observe that a point in the cartesian space here, a point x, y, for this red point.
00:16
So this really means when i drop this down, the value here is x.
00:20
And when i drop this across here, the value here is y.
00:24
So the distance here is x and the distance here is y.
00:28
Now my red point can be joined to my origin.
00:33
Now it can be called r here, the distance between origin and the point, and this teter here, starting from the positive x -sacist, it will be 0 degrees all the way anti -clockwise.
00:48
Now so this point can also be represented in polar form.
00:54
And so we can take x over r and this will give us cosine theta...