00:01
All right, in this question, i look this over and i want to point out that i think there's a typo in your question because the answers that you have are correct.
00:12
Cosine of theta equals four -sevenths.
00:15
Theta would equal 55 .2.
00:17
I'm assuming you did that with a calculator, which is correct.
00:22
Inverse cosine of four -sevenths.
00:24
And if you type that in, you do get 55 .2 when you round it to the nearest hundred.
00:29
The same with that tangent of negative 16 inverse tangent negative 16 now when you do that one you actually get an answer which i saw that you did that correctly it gives you an answer that's in quadrant 4 let me check them in the wrong mode it actually gives you negative 86 .4 and what you had to do and then you did it correctly is add 180 to that to get the proper reference angle so that your angle is between 0 and 180.
01:11
That's where i think this question has their typo.
01:15
I think it's meant to be between 0 and 360.
01:19
Typically, these questions are asked between 0 and 360.
01:23
So my bet is what you need to do to the first angle, 55 .2.
01:28
Again, you keep that.
01:29
That's a correct answer.
01:31
But we need what other quadrant cosine is positive in...
