00:01
Okay, so when i'm given cosine of an angle, the first thing i need to think of is in my unit circle, when i have 0, 90 degrees, 180, 270, and 360.
00:11
Where is cosine positive? well, cosine is related to my x -axis.
00:15
Where is my x -axis positive? in my first, second, third, and my fourth quadrant.
00:23
So what this means is when i get theta by itself, so i take the arc cosine of both sides, right? inverse of cosine is arc cosine.
00:32
I could just plug this into my calculator, but make sure i'm in the mode of degrees.
00:36
So arc cosine of 0 .5787925.
00:42
This will be approximately 54 .6 degrees.
00:46
How does it want me to round? that's the nearest degree, 0 .6 degrees...