00:01
I'll admit that i'm not a huge fan of the notation that they have here.
00:05
But anyway, make sure that you're in degree mode.
00:10
And they're talking about acute angles.
00:12
So we want to make sure our answer for the use theta to be between 0 and 90 degrees.
00:20
And if you use a calculator, it'll spit that out anyway.
00:23
But in my opinion, what you should do if you're ever given a problem like this, 0 .5354, 5354, yep, is to do the inverse sign on both sides, because that cancels out with sign, and then you're just left with theta is equal to, and go to your calculator in degree mode and type that in.
00:54
And now write the answer as 32 .4 degrees.
00:58
They said 10th of a degree.
01:01
Same thing goes with the next one.
01:04
Acute angle to the nearest tenth of a degree where they give you cosine of theta is equal to 0 .7428.
01:17
And again, the theme is to do the inverse cosine.
01:20
So find the button on your calculator.
01:23
Or you can type in either second cosine or something similar to that.
01:28
And you get the correct answer to the nearest tenth of a degree is 42 .0 when you round correctly...