00:03
Okay, we are trying to verify another identity here.
00:12
We have clearly a quite more complicated side on the left to work with here.
00:19
So that's what we're going to work with.
00:23
We can see clearly that we need a common denominator.
00:27
Although that side does have cosine versus one of the more complicated identities like the right, i think because it's so complicated, there's going to be a better chance we're going to reach our final answer if we work from there.
00:40
So the first thing we want to do, like i said, is get that common denominator.
00:46
After we do that and we multiply everything out, we end up with cosine times one minus cosine, minus cosine times one plus cosine, and that is all over one minus cosine times one plus cosine.
01:28
Okay.
01:30
Now we're going to multiply out, combine what we have here.
01:33
Clean this up a bit.
01:36
After we do that, we have cosax minus cosine squared x, minus cosine squared x.
01:58
And that is all over 1 minus cosine squared x...