Mathematics, 30.07.2019 15:30 aaliyahmaile13
Find all solutions to the equation in the interval [0, 2π). cos 2x - cos x = 0 a. 
b. 
c.
d. no solution
Answers: 1
![\bf cos(2\theta)= \begin{cases} cos^2(\theta)-sin^2(\theta)\\ 1-2sin^2(\theta)\\ \boxed{2cos^2(\theta)-1} \end{cases}\\\\ -------------------------------\\\\ cos(2x)-cos(x)=0\implies \boxed{2cos^2(x)-1}-cos(x)=0 \\\\\\ \stackrel{\textit{notice is just a quadratic}}{2cos^2(x)-cos(x)-1=0}\implies [2cos(x)+1][cos(x)-1]=0\\\\ -------------------------------](/tpl/images/0150/9753/06aa7.png)
Another question on Mathematics
Mathematics, 20.06.2019 18:04
Carly bought a new house for $125,000. the value of the house appreciates approximately 3.5% each year. what will be the value of the house after 10 years?
Answers: 1
Mathematics, 21.06.2019 17:00
Evaluate the expression for the given value of the variable. 5×(h+3) for h=7
Answers: 1
Mathematics, 21.06.2019 18:00
Describe the relationship between the angles of similar triangles and the sides of similar triangles
Answers: 1
Mathematics, 21.06.2019 19:00
Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.
Answers: 3
You know the right answer?
Find all solutions to the equation in the interval [0, 2π). cos 2x - cos x = 0 a. [tex] 0, \frac{2 \...
Questions
History, 27.07.2019 06:30
Mathematics, 27.07.2019 06:30
History, 27.07.2019 06:30
English, 27.07.2019 06:30
Mathematics, 27.07.2019 06:30
English, 27.07.2019 06:30
