Answer:
Step-by-step explanation:the answer is : Name the relationship between the angles below. What is the sum of the angles? Explain how you would find the missing angle. Explain each step. (replace with 120 & x)
2cos²x + cosx − 1 = 0
(cosx+1)(2cosx-1)=0
so cosx+1=0
or 2cosx-1=0
1) cosx+1=0
cosx=-1
x=π+2πk, k∈Z
2) 2cosx-1=0
2cosx=1
cosx=0.5
x=+-
![\frac{ \pi }{6}+2 \pi k](https://tex.z-dn.net/?f=%20%5Cfrac%7B%20%5Cpi%20%7D%7B6%7D%2B2%20%5Cpi%20k%20)
, k∈Z
find value for the interval [0, 2 pi )
{
![\frac{ \pi }{6}, \pi , - \frac{ \pi }{6}+2 \pi k](https://tex.z-dn.net/?f=%20%5Cfrac%7B%20%5Cpi%20%7D%7B6%7D%2C%20%20%5Cpi%20%2C%20-%20%5Cfrac%7B%20%5Cpi%20%7D%7B6%7D%2B2%20%5Cpi%20k%20%20)
}
Answer:
The acceleration is 5/6
(Im not that sure bout it tho)