00:01
And hopefully you've done enough problems to understand how this is a factorable problem.
00:07
It might seem like magic, but my teacher's taught me to guess and check.
00:14
And i'm really good at it.
00:16
So that's how i'm going to teach us to keep this very simple.
00:19
Because there's only two ways to get 15.
00:22
That's going to be 1 in 15.
00:24
But the one that actually works is 5 and 3.
00:29
And there are two ways to get 8.
00:32
To one in eight, and the one that actually works will be four and two.
00:38
Now, as i've already done the math of my head, i already know this works, because as you were to foil this out, the outside term is negative 20 sine of theta.
00:47
The inside is negative six sine of theta, which is exactly what we want in the middle.
00:52
So what does that tell me is that sine of theta is equal to two -fis, and sine of theta equals four thirds.
01:00
Now, let's cross off one of these options, because, sign is the y coordinate on the unit circle well the highest y coordinate it can be is one so the highest it can be is one will it ever reach four thirds or 1 .3 no that is not a possible answer now again make sure you're in radian modes because the directions that tell you from zero to two pi is your clue that you only want the radiant answers well they're parentheses but it doesn't matter it doesn't equal 0 or 2 pi...