00:01
Okay, so since the directions ask you to switch in terms of sine and cosine first, i'm going to do that.
00:07
So, sicken is one over cosine, and then tangent is sign over cosine.
00:19
And the same thing with the next one, one over cosine, minus sine over cosine.
00:25
Now, there's so many different ways to go from here.
00:28
I'm just trying to follow the directions.
00:31
Because if i look at this, i'm tempted to foil it first, but you could actually put them together first as, you know, because they're all the same denominator, one plus sign of alpha, and then times, you know, this one minus sign of alpha.
00:51
I keep saying alpha.
00:52
I should just say a.
00:53
Sorry about that.
00:54
And now we can multiply straight across.
00:57
So in the denominator, you have cosine squared of a because we're actually multiplying.
01:03
So when you're adding or subtracting, you don't do anything with the denominators.
01:06
You just make sure that they're the same and put them together...