The length of the third side can be expressed as an inequality...
0 < 3rd side < 39, depending on the angle
Answer:
b
Step-by-step explanation:
Start at the origin. Go the right 1 unit. Then go up 3 units
You are at Letter B
The answer is B simply because it says it is the mean, meaning it cannot be the range.
There are an infinite number of solutions, so I don't plan to list them all.
I'll list two of them, and then describe how to get all of the rest.
You said that <u>2cos(x) - 1 = 0</u>
Add 1 to each side: 2cos(x) = 1
Divide each side by 2: cos(x) = 1/2
The angles whose cosine is 1/2 are 60 degrees, 300 degrees,
and any multiple of 360 degrees added to either of those.